The shirt shows the Mona Lisa pinching her nose with one hand and holding a roll of toilet paper in the other, set against a swirling starry night sky in an ornate gold frame.
Two famous paintings have been combined and then given a third idea neither of them had.
The joke is entirely in how seriously the painting technique is taken. The brushwork is imitated properly, which is what makes the toilet roll land.
For the gallery shop crowd, for anyone who enjoys art history undermined, and for a bathroom wall.
