No smoking in the greenhouse please.

It turned out days before my event that some sneaky smokers had been using my greenhouse as a lovely warm area to get away from the March chill. It's an art installation not a 'Let's be kind to smokers tent!'
I guess that is the problem with leaving an installation unattended!
A friend of mine kindly made a sign which read,s "Please Keep Out, ART IN PROGRESS."
Genius.