Huh, cool. Mystery solved. Crazy how knowledgeable people here are... I tried to figure it out by Googling and wasn't getting anywhere, but got an answer here within five minutes. Thanks a lot!
I saw James Blake's show at the 9:30 Club in Washington, DC, this past weekend, and they used a lighting instrument that neither I nor my theater/dance lighting-designer boyfriend could identify -- I guess it's probably mostly used for concerts? It sort of looked like a satellite dish, with a...