Ship of Fools
Hieronymus Bosch, 1490-1500
Oil on wood
58 × 33 cm, 22.8 × 13.0 inches
Louvre, Paris

The painting is dense in symbolism:

The owl in the tree is symbolic of heresy, as is the Muslim crescent on the pink banner that flies from the ship's mast.
The lute and bowl of cherries have erotic associations.
The people in the water may represent the sins of gluttony or lust.
The inverted funnel is symbolic of madness.
The large roast bird is a symbol of gluttony. The knife being used to cut it down may be a phallic symbol or it may be symbolic of the sin of anger.
A monk and a nun are singing together. This has some erotic overtones (especially with the presence of the aforementioned lute) since men and women in monastic orders were supposed to be separate.

In the 15th century, everything was erotic [g].