Blivet
The blivet is an undecidable figure, an optical illusion and an impossible object. It was known in 1964, and one was shown on the March 1965 cover of Mad[?] magazine. It is also called a "two-pronged trident" and a "three-legged widget".
It is also called a "two-pronged trident" and a "three-legged widget".
