An All-Star Cast

I've always liked this picture (click for a larger pic). It was painted by Raphael, and is called The Disputation (La Disputa). A good explanation of the painting can be found here. Here is an excerpt:

The fresco can be seen as a portrayal of the Church Militant below, and the Church Triumphant above. A change in content between a study and the final fresco shows that the Disputa and The School of Athens can be seen as having a common theme: the revealed truth of the origin of all things, in other words the Trinity. This cannot be apprehended by intellect alone (philosophy), but is made manifest in the Eucharist.