View Single Post
Old 06-12-2009, 12:12 PM   #1673
Chaos Technician
alkemical's Avatar
Aethyr Engineering

Join Date: Apr 2001
Location: 4th dimension
Posts: 43,338



In baseball, a curveball creates a physical effect and a perceptual puzzle. The physical effect (the curve) arises because the ball’s rotation leads to a deflection in the ball’s path. The perceptual puzzle arises because the deflection is actually gradual but is often perceived as an abrupt change in direction (the break). Our illusions suggest that the perceived “break” may be caused by the transition from the central visual system to the peripheral visual system. Like a curveball, the spinning disks in the illusions appear to abruptly change direction when an observer switches from foveal to peripheral viewing.
alkemical is offline   Reply With Quote