PIX is a program that has a large database of labeled images. All of these images are pictures of concrete objects (a horse, a table, a house, a flower, etc). The program picks an object at random, finds 4 random images of that object from its database, distorts them at random, presents them to the user and then asks the question "what are these pictures of?" (See the example below.) Current computer programs are not able to answer this question.

To see PIX running, click here.