I was in the gift shop of a small art gallery the other day when I bought a postcard depicting a bunch of different keys. The postcard turned out to be a reproduction from the six-volume dictionary and encyclopedia Larousse du XXe siècle (me neither) and the keys come in a gorgeous range of shapes and sizes. The Roman key is broad and boot-shaped. The Merovingian looks like part of a crank.
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Eurogamer