Spotted in Louisville: Butterfly Notes

I had a very brief trip to Louisville recently and sadly I didn't get to explore much of what seems like a really cool town. I did however walk around the block that my hotel was on and coming through the alley I spotted this small grouping of paper butterflies that appeared to be stuck on the wall with chewing gum. There was some cryptic handwritten text on them about masonry, so perhaps they were a really ill-conceived ad campaign, but if they were just street art it was quite lovely surprise to come upon.