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I think the blinking lights were a pretty cool demonstration of how our I-function dictates our vision. My perception of how the lights moved (the direction of the blinking lights) was solely based on what my I-function determined. When I concentrated on changing the movement of the lights, my visual perception of how the lights moved changed as well. Interestingly, I was not able to visualize two directions at once - perhaps this is reflective of how we only have one I-function.

This can be translated to the ambiguous pictures or even the checker board. The I-function determined that the presented image was a black and white checker board so that is how one visually perceives it. Despite the fact that the "black" and "white" tiles were of the same color, since the I-function determined them to be different colors, we perceived the tiles as different colors.

My point -- the I-function totally dictates our vision.