An Alien Message

Today was my turn to sit out show at the gallery. Throughout the morning I took a batch of admittedly nondescript shots of the show - non of which I would want posted here but as I was packing up to go I glanced at the far wall and saw this. I turned around and looked up to see what was making this "Alien" Morse codish message and found it to the then really tiny holes punched in the retractable skylight blinds,