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Exploring a Complex Space-Filling Shape
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In this activity, learners build a paper stellated rhombic dodecahedron, a three-dimensional 12-pointed star.

Stereoscope
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In this activity, learners construct a device that allows them to view 2-D images in 3-D.

Scaling Cubes
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In this activity, learners explore scale by using building cubes to see how changing the length, width, and height of a three-dimensional object affects its surface area and its volume.

Exploring Tessellations (Grades 3-5)
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In this activity, learners repeat patterns in two and three dimensions to create tessellations.

Exploring Tessellations (Grades 6-8)
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In this activity, learners design unique tiles and make repeating patterns to create tessellations. This activity combines the creativity of an art project with the challenge of solving a puzzle.

Geometry Construction: Polyhedral Playthings
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In this activity, learners create 3D geometric shapes using straws and pipe cleaners.
Why Are Two Eyes Better Than One?
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In this activity, learners explore how their depth perception would be affected if they only had one eye. Learners work in pairs and attempt to drop a penny in a cup with one eye covered.

Exploring Tessellations (Grades K-2)
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In this activity, learners repeat patterns in two and three dimensions to create tessellations. This activity combines the creativity of an art project with the challenge of solving a puzzle.