Zeuxis, Parrhasius and the London tube dog

The painting contest between Zeuxis and Parrhasius is well known. Pliny the Elder recounts how the 5th-century BC painters competed for, one might say, photographic realism:

'[Parrhasius], it is recorded, entered into a competition with Zeuxis, who produced a picture of grapes so successfully represented that birds flew up to the stage-buildings; whereup…