It looks like some weird kind of time anomaly-- the people from 1905 are standing on the beach watching kids playing in the water in 2010. The cop (Time Cop) is trying very hard to keep everyone away from the invisible time portal that exists just at the edge of the water.

A very strange photo.

This picture really gives the viewer a sense of being part of the scene. I feel as if I'm standing alongside the other people watching the swimmers frolic. Wonderful effect.

Great shot. Can't help but notice the cop controlling the crowd with what looks like a billy-club! Yikes. Don't roughhouse too much Billy. Officer Mike Grabowski will not hesitate to give you a thumping.

Every one of them lean and muscled. Not a single chubby kid in sight.

Most of the kids could be from the 21st century. If you isolate the two boys at the front for instance, the photo could have been taken today. Zoom out though and the Keystone Kop kind of gives it away.

Or did she put on a chocolate cake by mistake?

That is probably the North Avenue pier in the background, the spit of land in this recent photo.

Other than being all male, the crowd of kids does not look too different from the modern Saturday afternoon swimming group.

Notice the almost complete absence of bathing-costumes on these boys. Scandalous!