Mark 1

On the back door.

What is it, paint?
Why would paint be anywhere near there?
Someone has tried to rub it off... unsuccessfully.
I'm sure it will disappear if I think hard enough about the door being pristine.
Or should it be left (building the character of the building)?
No, I think I'm going to think it away...

This could be a series...

12 (forgot to put a link up yesterday, now fixed)