What do you think inspired the name of this ceiling's texture?

I took this photo inside the auditorium at the Arlene Schnitzer Concert Hall while standing in the balcony. I got to see where I'll be sitting in March when I attend "1964 ... the Tribute," right on the front row of the balcony. I think that's just fine for someone who kept putting off getting a ticket. Hooray!

Here's closeup to help you guess.