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- A graded set of ten wooden square prisms, all 20 cm in length and differing from one another in two dimensions, height and width, and increasing regularly in width - the narrowest being 1 cm and the widest 10 cm.
- DIY: Use brown construction paper or cardstock to make ten rectangles or square prisms with same length (all 20 cm) and varying height and width (edges increasing by 1cm, starting from 1 cm to 10 cm); or
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Classic Activities - Sensorial - Visual
