Tralfamadore and the Tralfamadorians

 Tralfamadore is a fictional, "alien" planet, home to the Tralfamadorians. It has appeared in several Kurt Vonnegut novels including Slaughterhouse-Five, Hocus Pocus, and God Bless You, Mr. Rosewater.

The Tralfamadorians (pictured below) were described in Slaughterhouse-Five by the protagonist, Billy Pilgrim:

"two feet high, and green, and shaped like plumber's friends. Their suction cups were on the ground, and their shafts, which were extremely flexible, usually pointed to the sky. At the top of each shaft was a little hand with a green eye in its palm. The creatures were friendly, and they could see in four dimensions. They pitied Earthlings for being able to see only three. They had many wonderful things to teach Earthlings about time."