phi phenomenon
n. An apparent movement from one location to the other, which is perceived when two lights quickly flash on and off near each other. This is common in lighted signs with rows of bulbs which rhythmically go on and off.
n. An apparent movement from one location to the other, which is perceived when two lights quickly flash on and off near each other. This is common in lighted signs with rows of bulbs which rhythmically go on and off.
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