Cut out cardboard circle, circling the rim of a tea cup. On one side of the left half circle, draw a figure of a boy, and on the other side - a figure of a girl who should be located in relation to the boy upside down. Left and right of cardboard make a small hole, insert the gum loops.
Now drag the eraser in different directions. Cardboard circle will rapidly spinning, pictures from different angles align and you will see two figures standing side by side.