 The main difference between the two is their hair color (Block is a redhead, while Shapey is blond) and head shape (Shapey's head is round while Block's is more thin); their behaviors are much the same (although Block is often in a happier mood and rarely does he scream).In the episode "Numb", Bloberta finally figures it out after going through a family album.When she goes to the Posabules' house to retrieve him, Mrs. Posabule gives back Shapey and abandons Block after he shows love for Bloberta, forcing her to adopt Block.