Courtesy of and © Copenhagen City Museum / Københavns Bymuseum.
Here's one for the designers out there. This is a photo from 1935 featuring a dad and his son on a rather unique sidecar'ish kid's attachment. Doesn't look like the kid can pedal, but he gets the whole lovely experience on that perch.
The Copenhagen by Bike exhibition at the Copenhagen City Museum / Københavns Bymuseum runs from now until June 27, 2010