"The Golden Rectangle, the Golden Triangle, and the Golden Pyramid, all based on the Golden Ratio are all appear prominent in the work of Leonardo Da Vinci. He referred to the Golden Ratio as the "divine proportion".
What is art for? Alain de Botton's animated guide – video In this exclusive video for the Guardian, philosopher Alain de Botton gives his top five reasons why art is such a vital force for humanity. Are we wrong to like pretty pictures? Watch and find out