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Are there boxes, is this an illusion, or is this real life Q-bert? Illusions are always fun to build especially when you can build them.

In this activity about depth perception, learners create an optical illusion in a shoe box.

Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent.

We don't normally view people upside down and so our brains aren't accustomed to it.

In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

In this fun and interactive online exhibit, the straight lines of a tile wall appear to curve. The learner moves the rows of tiles and changes the color of the grout to achieve the intriguing effect.