Tool materials: small card paper, scissors, small brush, watercolor paint, old newspaper, rope, two-legged ruler and ruler.

Set the compass to a radius of 5 cm, and then draw a circle with a diameter of 10 cm on a piece of card paper. Keep the bipod set at 5 cm, and make 6 marks on the line at equal intervals along the circumference.

Use a ruler to connect two points into a straight line through the center of the circle. This divides the disc into six equal parts. Cut the disc and nail two holes about 1.2 cm from the center of the circle. These two holes are used for threading ropes.

Spread a newspaper on a table or countertop, and paint a pizza-shaped part blue with watercolor paint and brush. Now, according to the direction of the hand, draw all the parts on the disc in turn with green, yellow, orange, red and purple.

When the color is dry, put a rope through two holes and tie the two ends of the rope together to form a coil. Put the disc in the middle of the rope loop and use 1 or 2 with both hands.

Lift the rope loop with your fingers. Turn the disc to bend the rope loop, and then slowly pull the rope loop to turn the disc. When the disk rotates rapidly, these colors mix together to form white. This completes the seven-color turntable.