A flipper flapper is a cool maths fidget toy that flips infinitely, revealing a set of different faces.
Here's the flipper flapper in action:
And here's how to make it:
Cut out two squares of cardboard. The second square will become the base.
Cut both squares in half.
Mark the centre line and fold the top and bottom to the centre line.
Mark the top right, top left, bottom right, and bottom left sections of the second square.
Glue these marked sections onto the second square.
And that's it! Here's the completed Flipper Flapper.