A homothety of the plane is a zoom (magnification or reduction) of
the plane. The center of a homothety is the unique point of the
plane which stays unchanged after the homothety.

Homothety shoot is a visual game/exercise.
It presents you two shapes, one being the image of the
other after a homothety in the plane. And you are asked to find out the
center of the homothety by clicking on the picture.