Creepy Seek and Find in Chestnut Hill: Video Clip

Ok, GAP readers, who has spied the coolest nighttime window display on the Avenue?  Here's a video clip:




Googling is CHEATING!  If you haven't already located these creepy, crawly, swimmy creatures, you have 5 more nights to find them.  I'll give you a hint... if you hit up a certain ice cream shop, you're getting awfully close, but the display is best viewed after dusk.

So... WHERE, and more importantly, WHAT are they?  Fish?  Stingrays?  Flying rats?  Eeek!  There's definitely a science lesson in there behind the scenes.