I am fascinated by ALL bicycles!!
BTW - you missed out recumbents, and by "trike" I'm not sure if you meant recumbent trikes, like my father's Cattrike ... or trikes, like the adult sized tricycles which the British ride the PBP on.
You also missed "triplettes" like the triplette that was ridden on the PBP in 2003.
And most importantly, you missed "sport touring" bicycles like MACHAK!!
Machak is not a racing bicycle and is not a touring bicycle ... he's a sport touring designed for long distance events like randonees and also light touring (although I've done some pretty heavy touring with him).