In the Orbison illusion, the squares closer to the image's center seem larger than the outside squares. The radiating lines and center point trick us into thinking we are moving forward toward the center point. The result is a perception of what the image would look like a tenth of a second into the future. Credit: Mark Changizi, RPI. Key to All Optical Illusions Discovered
In this illusion, looming toward the center leads to the brightness expanding outward, while looming away does the opposite. Credit: Mark Changizi, RPI
Key to All Optical Illusions Discovered
In this so-called Hering illusion, the straight lines near the central point (vanishing point) appear to curve outward. This illusion occurs because our brains are predicting the way the underlying scene would look in the next moment if we were moving toward the middle point. Credit: Mark Changizi, RPI. 
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