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When a Sparkler Is Twirled Rapidly, People Perceive a Circle

Question 31

Multiple Choice

When a sparkler is twirled rapidly, people perceive a circle of light. This occurs because


A) the trail you see is caused by sparks left behind from the sparkler.
B) longer light wavelengths from the sparkler produce a visual echoic effect.
C) the length of iconic memory is about a fraction of a second.
D) Gestalt principles work to complete the circle in our minds.

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