Geek in my week - a Fringe moment in London

I was midway through an afternoon drinking session with some friends at the weekend and we walked by a place that had a strange glimmer.

Pic: taken by me

I was tempted to go inside and ask for the key to the back room (I had some typing to do) but thought this might be out of character for the Anne on this side. I am, after all, Anne-other from the altiverse where everything is slightly red.... (Please don't tell my sister.)