The three wise monkeys are a nice pictorial maxim. 見ざる, 聞かざる, 言わざる which literally means “don’t see, don’t hear, don’t speak”. It got a negative connotation in the western world.
I really like the old interpretation.
Look not at what is contrary to propriety; listen not to what is contrary to propriety; speak not what is contrary to propriety; make no movement which is contrary to propriety.
It does not have this negative touch, if you see propriety in the eye of the beholder.
Find a “Three Monkeys” wallpaper in Full-HD (1920×1080) here:
Edit 1: There are pictograms of the three monkeys in unicode! See page 2 in the right column middle section.