In the Doric temple, such as the Parthenon, there were two contradictory rules. Every other triglyph had to be placed over the center of each column below it. And yet each architrave had to end with a triglyph at the corner or at the right angle turn of the temple so that the triglyphs on the front and the side would touch each other. This is called the angle triglyph problem. How can you make it work? You might wanna go back over that, play that again and so you understand it exactly what I'm saying to you. Cuz in order to make it work out the Greeks had to gradually shift the triglyphs that were closer to the corners of the temple a little more over. Until by the time the triglyphs were placed at the corner of the temple they had eaten enough space to fit right at the corner, do you see? This meant that each triglyph and metope had to be cut to a slightly different size in order to cheat those triglyphs over towards the corner of the temple. Well the Doric style being so firm and heavy and sturdy was often used to make academic buildings, even on campuses as remote as the South Western United States, such as the University of Arizona. Take a look with us now at the engineering building, for example, of the University of Arizona, constructed during a classical revival period in America in 1918, right after World War I. As we pan over, see how many Doric characteristics you can find. When we get up close to the building we can see that there are two triglyphs between each column. And the triglyphs are in fact centered over each column. But what happens when we get to the corner of the structure? And this is the big question, the angle triglyph problem. Will the architect of 1919 know that he is supposed to have a triglyph on the end of his building meeting with another triglyph, coming around the corner at right angles? Will he let those two triglyphs fit snugly together at right angles? Let's look. In fact, quite disgracefully, the Tucson architect has failed us. He has left a little bit of metope at the corner, an act which would have evoked disapproval, indeed disgust, from an ancient Greek architect. I have always believed that the architect of the University of Arizona's 1918 building, realizing too late what he had done, planted those mammoth Cyprus trees that you see right in front of this spot so that his blatant error could not be seen by those walking by. He may have feared that someone such as each of you would know that he had violated the angle triglyph problem and he's in shame. His shame would endure through generations. What has made it all the worse is that he did it to the engineering building.