14th century example of the four unique
โ
Ralph W. Pridmore
๐
Article
๐
2006
๐
John Wiley and Sons
๐
English
โ 179 KB
## Abstract It is generally thought that Ewald Hering (19th century), or possibly Leonardo da Vinci (16th century), first recognized the concept of four unique hues (blue, green, yellow, red). However, in the Alhambra palaces, Granada, Spain, in a room roped off from tourist traffic, is a stained g