In Zwolle I walked in a small alley with a long wall at one side which was painted in all different parts. This one with the eyes had a funny text I'll try to translate in english.
"Hello neighbour, is it okay I peek for a moment, because I am so curious what is behind your wall".
The open eye has a hole to watch through. In dutch it is on rhyme and sounds more rhythmic.
This is the alley. See for more Monday Murals here