Um...How?

Can you guess what this is?

Did you say the cealing? You would be correct. Except let's take a closer look...

If you can give a good reason why there are handprints on the ceiling of the Basse House, we would appreciate it.

note: the handprints showed up several months before the fan. Noone had a camera though.

additional note. we would like a good story. Not a true one. Thoes are boring.