The spinners are flat plastic discs, each with six slightly different images printed on them. When seen in succession, the images create the illusion of movement. The faster the disc is spun the faster the animal moves. Rotate the disc backwards and the animal appears to move backwards.
Each spinner comes with its own suction cup, bracket and nylon thread, so that the spinners can be attached to windows yet able to catch the slightest movement of air and rotate.
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