Do orbs have an opinion about drywall?

Sometimes we can find the most interesting visitors in a construction site.

In this case we encountered some orbs. Wow, was my first reaction. I  can honestly say in this case I have no idea why there was so many of them. 

Maybe it was a sign saying spray orange peel texture. Sometimes we get to see one or two orbs, but this defenitely got out of hand.

Well whatever the reason was, those orbs left as soon as they finished.

The funny thing about the texture was orange peel.