This fun, interactive, nights-only public artwork runs through Sunday evening.

I stopped out last Friday, and especially with the weather warming up it’s definitely worth a half-hour look-see.

The projected lights that respond to human movement — all of which is captured and projected on a big screen hovering over the square — is the kind of thing that gets little kids hopping frantically about in hopes of getting a spot or line of light to move, or else laying on the ground in hopes that their outlines will show up on screen.

As pictured, some adults have enjoyed getting in on the game, too.

Renee Piechocki, who heads the city’s Office of Public Art, says “Congregation” has even been drawing repeat visitors, including hotel workers, construction laborers and other shift workers whose schedules let them duty just as the artwork is in full swing.

Here’s Nadine Wasserman’s review of the piece for CP.

"Congregation," the first installment of the Market Square Public Art project runs from dusk to midnight tonight and tomorrow, and dusk to 10 p.m on Sunday. (Sunset these days is about 7:30 p.m.)