The covers are moved around, and the rabbits are found to have exchanged places. This is repeated a number of times, and your audience believes they have caught you out. They inform you that the rabbits are White on one side and Black on the other, and you are merely turning them around to change places.
Finally you turn the two rabbits around, and show that they are not Black and White as the audience believes, but two entirely different colors Red and Green.
These are stage size about 11 inch high, with cut out wood rabbits.