This is a fun trick. If you cut a paper loop in the center you get 2 loops. But if you cut a paper infinity loop you just get a larger loop. Kids for whatever reason find this interesting. Its a simple craft to do just to prove it to yourself. Try
by artsy dc
by Masakazu Kawai
by easy origami
by Easy Kids Craft
by Craft Activities For Kids
by mizutama.soap
by FUN4YOU TV