Sensorial
Materials that isolate one quality — size, color, shape, weight, sound — so the child can sort and name it.
38 works · 10 strands
See on the mapWhy this area comes where it does
Follows Practical Life once the child can carry a material and work through a sequence. Each material varies only one quality, so the child refines one sense at a time and learns exact words for it. The materials are the concrete preparation for mathematics (Red Rods → Number Rods; binomial cube → algebra) and for writing (Geometric Cabinet → Metal Insets).
It prepares the child for
- mathematics (length, grading, base-ten dimensions)
- geometry
- writing (tracing shapes)
- precise vocabulary
Visual — Dimension
10 worksMaterials that vary in size only — diameter, height, length, thickness, or all three — so the child learns to see and grade differences in dimension.
Why this order
Dimension comes first because size is the easiest visual difference to see and the materials give the clearest feedback: a cylinder that does not fit, a cube left over. Each material isolates one quality (the Pink Tower varies in three dimensions, the Brown Stair in two, the Red Rods in one) with the other qualities held constant, so the child attends to that single difference. The order moves from materials with a built-in mechanical control (knobbed cylinders) to materials the child must judge by eye (Pink Tower, Brown Stair, Red Rods, knobless cylinders), then to naming the qualities and working from memory. This strand is the indirect preparation for mathematics: the Red Rods are the same size as the Number Rods, the Pink Tower cubes relate to the cubes of the bead material, and the pincer grip on the knobs prepares the hand for holding a pencil.
- SE 1.01Knobbed Cylinders: First BlockThe child removes ten knobbed cylinders from one block and returns each to the hole it fits.
- SE 1.02Knobbed Cylinders: Remaining BlocksThe child works with the other three cylinder blocks, each varying a different dimension.
- SE 1.03Pink TowerThe child builds a tower of ten pink cubes from the largest (10 cm) to the smallest (1 cm).
- SE 1.04Brown StairThe child grades ten brown prisms, all 20 cm long, from thickest (10 cm) to thinnest (1 cm).
- SE 1.05Red RodsThe child grades ten red rods from 10 cm to 1 m long.
- SE 1.06Naming Dimensions: Three-Period LessonThe guide gives the words for dimension (large/small, thick/thin, long/short, tall/short, wide/narrow) and their comparatives and superlatives using the materials the child already knows.
- SE 1.07Knobbed Cylinders: Combining BlocksThe child works with two, three, and then all four cylinder blocks at once, with the cylinders mixed together.
- SE 1.08Knobless CylindersThe child grades four color-coded sets of knobless cylinders by eye, with no block to check against.
- SE 1.09Pink Tower and Brown Stair CombinedThe child places Pink Tower cubes beside and on the Brown Stair to see that each cube matches the end of one prism.
- SE 1.10Dimension Memory Games (Bringing from a Distance)The child holds a size in memory and brings the matching or next piece from across the room.
Visual — Color
5 worksColor tablets that isolate hue and then shade, moving from pairing primary colors to grading seven shades of nine colors.
Why this order
Color is presented alongside or just after the first dimension materials because pairing needs only the ability to see "same" and "different". Box 1 (three primary colors) removes almost all chance of error; Box 2 (eleven colors) adds more choices and the names of colors; Box 3 asks the child to grade shades, which is harder than pairing because the child must compare each tablet with its neighbors. Size, shape, and texture of every tablet are identical, so color is the only difference. Grading shades prepares the eye for art work and for the idea of ordered series used in mathematics.
- SE 2.01Color Box 1The child pairs three primary-color tablets: red, yellow, and blue.
- SE 2.02Color Box 2: Pairing and NamingThe child pairs eleven colors and learns their names through three-period lessons.
- SE 2.03Color Memory GamesThe child looks at a color tablet, walks across the room, and brings back the matching tablet from memory.
- SE 2.04Color Box 3: Grading ShadesThe child grades seven shades of one color from darkest to lightest and learns the words dark/darker/darkest and light/lighter/lightest.
- SE 2.05Color Gradation: Mixing ShadesThe child mixes paint to make a series of shades and matches mixed colors to the Color Box 3 tablets.
Visual — Form
7 worksPlane figures, solids, and constructive triangles that isolate shape, so the child learns to recognize, name, and combine geometric forms.
Why this order
Form follows dimension because the child must already handle insets and knobs with care and see small differences in outline. The Geometric Cabinet begins with three very different shapes on the presentation tray, then moves to drawers where shapes within a family differ only slightly. The form cards move from a filled shape to a thick outline to a thin outline, so the child recognizes a shape from less and less information; this is the direct link to reading printed shapes and letters. The Geometric Solids move from flat to three-dimensional form. Constructive Triangles and Superimposed Figures come last because they ask the child to see how shapes combine and relate in size, which is the sensorial preparation for elementary geometry. Tracing the insets with two fingers prepares the hand for the Metal Insets and for writing.
- SE 3.01Geometric Cabinet: Presentation TrayThe child removes and replaces a circle, square, and triangle inset after tracing the frame and the inset with two fingers.
- SE 3.02Geometric Cabinet: DrawersThe child works through the six drawers of the Geometric Cabinet, matching insets to frames and learning the names of shapes.
- SE 3.03Geometric Form Cards: Sets 1, 2, and 3The child matches the cabinet insets to cards that show each shape filled, then as a thick outline, then as a thin outline.
- SE 3.04Geometric SolidsThe child explores and names ten blue solids by looking, touching, and seeing how each one rolls or slides.
- SE 3.05Constructive Triangles: Rectangular Box 1The child joins colored triangles along their black guide lines to build squares, rectangles, and other shapes.
- SE 3.06Constructive Triangles: Triangular, Hexagonal, and Rectangular Box 2The child builds larger and more complex shapes, including hexagons, from the remaining boxes of Constructive Triangles.
- SE 3.07Superimposed Geometric FiguresThe child grades and stacks graded insets of a square, circle, and triangle so each smaller shape sits on the one larger.
Tactile
5 worksMaterials that isolate texture and temperature so the child refines the sense of touch through the fingertips and hands.
Why this order
Touch Boards come first because they show only two textures (rough and smooth) in fixed positions, so the child learns the light fingertip touch used in all later tactile work. Touch Tablets then separate the textures into pairs to match and grade. The Fabric Box adds many textures that differ in more than roughness. Temperature (thermic) is presented last because it is the hardest difference to notice and name. The light touch practiced here is the same touch used on the Sandpaper Letters and Sandpaper Numerals, so this strand directly prepares for Language and Mathematics.
- SE 4.01Touch Boards (Rough and Smooth Boards)The child feels boards covered with rough sandpaper and smooth surfaces using a light fingertip touch.
- SE 4.02Touch TabletsThe child pairs, then grades, tablets covered with different grades of sandpaper by touch.
- SE 4.03Fabric BoxThe child pairs swatches of different fabrics by touch and learns the names of fabrics.
- SE 4.04Thermic BottlesThe child pairs metal bottles filled with water at different temperatures, then grades them from hottest to coldest.
- SE 4.05Thermic TabletsThe child pairs tablets of different materials (such as metal, stone, glass, wood, felt) that feel colder or warmer to the touch.
Baric (Weight)
1 worksTablets of equal size that differ only in weight, so the child learns to feel differences in weight.
Why this order
The baric sense is presented after the child has worked with dimension and touch materials because the child must stay still, hold the hands steady, and concentrate with eyes closed. The tablets are the same size and shape, so weight is the only difference the hands feel. Because the wood color is different for each weight, the child can check the result without the adult.
Auditory
4 worksSound Cylinders and Bells that isolate loudness and pitch so the child learns to listen closely and compare sounds.
Why this order
Sound Cylinders come first because loudness (loud and soft) is easier to hear than pitch and the cylinders are simple to handle. Pairing comes before grading because matching two sounds needs less memory than ordering six. The Bells come later because pitch is a finer difference and the bells need careful handling with a mallet and damper. Close listening prepares the child for hearing the separate sounds in words (phonemic awareness) and for music.
- SE 6.01Sound Cylinders: PairingThe child shakes wooden cylinders near the ear and pairs the ones that make the same sound.
- SE 6.02Sound Cylinders: GradingThe child grades the sound cylinders from loudest to softest.
- SE 6.03Montessori Bells: Matching PitchThe child strikes a bell from the fixed set and finds the bell with the same pitch in the working set.
- SE 6.04Montessori Bells: Grading and NamingThe child grades eight bells into a scale by ear and learns the names of the notes.
Olfactory
1 worksPaired bottles of scents so the child learns to notice and match smells.
Why this order
Smell is isolated by using bottles that look identical, so only the scent tells them apart. It is presented once the child can carry out a pairing exercise (Color Box 1 or Touch Tablets) because the procedure is the same; only the sense changes. It builds attention to the environment and vocabulary for describing smells used later in science and cooking work.
Gustatory
1 worksPaired bottles of the four basic tastes so the child learns to identify and match sweet, salty, sour, and bitter.
Why this order
Taste is presented after smell because it requires strict hygiene routines and self-control (one drop, rinse between tastes). The bottles look the same, so taste is the only difference. It gives the child precise words (sweet, salty, sour, bitter) for experiences they already have at snack and meals.
Stereognostic
2 worksIdentifying objects by touch alone, using the hands and the muscles that move them, without looking.
Why this order
The stereognostic sense combines touch with the movement of the hands around an object, so it builds on the tactile strand and on handling the Geometric Solids. The Mystery Bag starts with familiar objects the child can name; the sorting trays ask for finer discrimination of small items by touch. This work strengthens the connection between hand and mind and prepares for recognizing shapes and letters by feel.
Algebraic
2 worksThe Binomial and Trinomial Cubes, presented as three-dimensional puzzles of color and size.
Why this order
These are the last sensorial materials because the child must hold a visual pattern in mind across two or three layers and compare many sizes at once. In the 3–6 classroom they are only puzzles: the child is not told about algebra. The cubes are a physical model of (a + b)³ and (a + b + c)³, and the same material is used again in the elementary classroom for algebra and cube root, so early familiarity makes that later work concrete.