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Mathematical turntable making
Step 1: Cut the hard card into a circle.

Step 2: Take a hard, sharp and slender post through the center of the circle (such as a toothpick).

Step 3: If you can't turn the card, replace it with a lighter circular piece of paper, or use a rough toothpick as a spindle.

Effect: a pillar in the middle and a round piece of paper outside. This is the simplest turntable. ...