Our history of architecture class

So I changed up our fine arts class mid-year, changing from Story of the Orchestra, which wasn't holding our interest, to Calvert's History of Architecture. So far we have enjoyed it. We complete two lessons per week. The first lesson involves reading a chapter and answer discussion questions. The second one involves an art project. So far, the boys have drawn pyramids, created trilithons and built ziggurats out of sugar cubes. 

Here is a finished ziggurat. Each level had to be a perfect square, to represent the Babylonian devotion to mathematics, starting with 7 cubes on the bottom. So it would take 49 cubes for the base, then 36 cubes for the next row, then 25, and so on. After some fiddling, the boys realized that they could not simply move in one row as they built up; Tom built one that went from 7 by 7 directly to 5 by 5 before he realized this.