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| 2.19 |
Sound Boxes |
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1 blue and 1 red box, each containing identical sets of 6
cylinders. |
| 2.21 |
Thermic Tablets |
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A divided box containing one pair each of felt, wood, glass,
marble, and metal tablets. |
| 2.23 |
Binomial Cube |
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A wooden box with lid and two adjacent hinged sides containing
8 wooden cubes and prisms painted red, blue, and black. |
| 2.24 |
Trinomial Cube |
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The trinomial cube is contained in a wooden box with lid,
having two adjacent hinged sides that open out to display 27
wooden component cubes and prisms painted blue, red, yellow,
and black. |
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