Colour Combination

Firstly grab a cardboard and find a circle object with a diameter of 10 cm. Afterwards cut out your circle and make holes in each of your circles. Find the centre point, measure 1 cm on either side of the circle and poke a nail into it. Also cut out 1 metre length of string for this process to work. Lastly  colour half of each side red, green or blue.

Then put the string through the holes and spin them to create changing colours.