1. Rome
The artists painted figures in black silhouette with a slip made of clay and water. ... The new developments of this new style can be seen in the marble Kritios Boy reflecting a moment in self-awareness in Greek history marked by the change from Archaic to Early Classical. Changing from marble to bronze for large-scale sculpture marked another development in the Early Classical period (Adams, p. 90). ...
Rather than building walls around the lake, the engineers designed the foundation to sit on the clay bed of the lake, nearly 25' below the ground level with drains built under the entire circumference of the foundation, as well as drains throughout the entire area inside the Colosseum spaced every 12'. ... Foundation engineering and planning for the Colosseum was a very big issue, mostly because of the material that it sits on, clay, and the fact the lake was naturally spring fed and on the site. ...