Here is an example of multiple von Schiller displays. Dots are flashed for 130 milliseconds at the upper left and lower right corners, then a blank screen is flashed for 130 milliseconds, then dots are flashed for 130 milliseconds at the upper right and lower left corners, followed again by a blank screen for 130 milliseconds. This sequence is repeated over and over. Your visual system makes two subjective dots jump back and forth together, sometimes side to side and sometimes up and down. Notice that all the pairs switch together. Visual Intelligence, page 148.
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