The entrance to my lab…, a photo by Manuel Jorge Marques on Flickr.

Via Flickr:
… or how many LASER warning signs you can fit around an entrance door 😀 .
And yes, I have a interlock system fitted to the lab door, even though I’m not using it (my superluminiscent source is only class IIIB, not too bad – it "only" outputs 6 mW! 🙂 )