Today's picture shows a boy with a new bicycle outside a bicycle shop. The bike looks to have lots of neat accessories, and looks to be a high end model. The picture was taken in 1921.
When I was a kid, one of the neatest accessories for a bicycle was a siren. They had these sirens that mounted down near the tire. When you pulled a little chain, the siren was brought into contact with the edge of the tire, and the tire would cause the siren to spin, and it put out a really LOUD siren sound. It sounded like one of the old air raid sirens. Neat thing about it was that it did not take batteries, so you could us it as much as you wanted.