Drehscheibe Spirale /Spinning Disc “Spiral”

Stations-ID: D012

?? English instruction:

• Spin the disk slowly.
• Concentrate your gaze on the centre of the spiral for approximately one
minute.
• Then turn your gaze to a motionless object, like your hand, or the wall.
• What can you see?
• What happens when the spiral is moving in the other direction?

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