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Disappearing Act
An animal that blends in with its environment is much easier to see when it's moving than when it's still.
Where: Crossroads: Getting Started
Everyone Is You and Me
By adjusting the light levels on either side of this half-silvered glass, you and a friend can merge your faces into a single composite face.
Gray Step
With the rope hanging down, the left and right sides of the board appear identical. Lifting the rope shows the dramatic difference that your eyes missed—and continue to miss, as soon as you let the rope fall again.
