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1. Chromatic - Color
Recognition and distinguishing the different shades of color using the Color Box 1,
Color Box 2 and Color Box 3.

2. Auditory – Volume Pitch
A sense, which can receive impressions only from movements going on about a subject.
Training in hearing must begin with silence as it departs from immobility to go on the
perception of sounds and noises caused by movement.
We hear better, that is, with greater acuteness, when we notice lighter sounds than we
did before. The training of the senses is that of distinguishing differences among the
stimuli. In order to do that, one must know how to classify the different kinds of
sensations and note their graduated differences. Sounds can be categorized into four
classes : silence, the human voice, noise and musical tones.
To study noises, we have the Sound Boxes and to study musical sense, we have the
Montessori Bells.

3. Tactile - Texture
To feel the differences and to distinguish the changes on the surface of materials using
the Touch Boards, Touch Tablets and Touch Fabrics.

4. Gustatory – Taste
Sense of taste is based upon the ability to identify four flavors – sweet, salty, bitter and
sour using the Gustatory Bottles.

5. Olfactory – Smell
Sense of smell using the Smell Bottles. Page : 11

6. Visual – size, shape, pattern, composition
Various series of materials show differences in dimensions : the first is concerned solely
with differences of one dimension, height; the second shows a graduated distinction in
two dimensions, area; the third takes up the differences in all three dimensions. The
educating of this sense uses the Pink Tower, Broad Stair, Long Rods, Knobbed cylinders
and Knobless cylinders.

7. Baric – Weight.
To study the impression of weight, we use the Baric Tablets.

8. Thermic – Temperature
To study the impression of temperature, we use the Thermic Bottles.

9. Sterognostic – Perceiving through tactile and muscular sense
When we touch something and feels the texture of the material, an impression of
movement is also stored in a “muscular memory“. When we touch something as we
move, two sensations – tactile and muscular, are mixed together and we call this
“sterognostic sense”. To enhance this particular sense, we use the Geometric
Presentation Tray, Geometric Cabinet and Cards, Tessellation, Flat Shapes, Constructive
Triangles, Binomial Cube and the Geometric Solids.