ID a funky (old?) very distinctive bike This bike I found on a Brazilian mountain bike Instagram page, they caption it as a bow and arrow with wheels.

Anyone ever seen this strange looking beauty before? I can't quite tell but it might be an early folding bike. I'm saying is old because it's got a rod brake.
This is a very old military bike, estimates say circa 1898, credited to a French officer and cycling advocate Captain Gerrard (although actually probably designed by someone else). It is indeed a folding bike, one of the first of its kind. Soldiers on bicycle were a relatively common thing prior to the first world war. Lots more information here, The BSA &amp; Military Bicycle Museum ; and here Captain Gerard history