This fun toy allows you to 'blend' two faces together. When you look into the 'mirror' the reflective strips show a reflection of your own face, and the clear sections allow you to see through the mirror, and see the other person's face. The end result is that you see alternating strips of both faces.
The resulting 'face morph' can have some comical results - you wink into the mirror, but if you have positioned the mirror so that it is your partners eyes that you are seeing, then the morphed face does not wink back. And if the morphed face is showing your partners mouth, and they suddenly smile, this is also an unexpected effect!
Ideally both faces should be of a similar size, and each face should be about 25cm from the mirror.