Arguably the most difficult conventional geometry unit. Like all summit units, there are no lecture notes. There are 4 categories named after the 4 periods of classical music and are weakly ordered by the ages of the techniques involved. In particular, classical period problems would be good fits for configgeo unit, and contemporary period problems are quite strange- many of those problems' diagrams are not based on triangles.

The unit teaches some niche theory but is otherwise just miscellaneous hard geo.

Notable problems

• 20USATST6: Probably the most difficult geometry problem to appear on an national or international contest ever.
• 21SLG8: A great lesson in common geo heuristics but not elementarily doable.
• 14SLG6: This showcases a different geo heuristic but equally valuable.