 Consider, for example, Ned Block’s Blockhead. Blockhead is a creature that looks just like a human being, but that is controlled by a “game-of-life look-up tree,” i.e. by a tree that contains a programmed response for every discriminable input at each stage in the creature’s life. If we agree that Blockhead is logically possible, and if we agree that Blockhead is not intelligent (does not have a mind, does not think), then Blockhead is a counterexample to the claim that the Turing Test provides a logically sufficient condition for the ascription of intelligence. After all, Blockhead could be programmed with a look-up tree that produces responses identical with the ones that you would give over the entire course of your life (given the same inputs).