A Morphology of Arches

My architecture department needs to be shaken up and challenged. I'm going to launch a training program and also get everybody to demonstrate their creativity by posting examples of their favorite work (that they've done themselves) on the walls of our office (which desperately needs to stop being an office and start being a "studio").
To kick this off I've created "A Morphology of Arches", which I'll print out nice and large, and mount in a prominent spot. I'm going to ask a few of my top staff to develop similar morphologies for vaults, domes, minarets and whatever else I can think of that's relevant to the work we do.
Any of you have suggestions?
Here it is... "A Morphology of Arches".