As a teacher, do you often observe others' lessons?

I've done so because I was asked to observe lol, but many times I've done so on a break so that I could see a master teacher work and learn from them. I think it's a vital part of being a teacher and a part of the life long learning that occurs. Sometimes by observing another person we can see what is working in our classroom and what is not, as well as learn a few tricks to put in our bag. It also helps us to understand our colleagues better and develop those relationships. Though, I admit I get very nervous and self-concious when someone is observing me. Namaste-Anora