This great Klimt painting was destroyed by German troops in 1945. They are not just friends, they are lovers. It looks like their bodies are melting into one embrace, becoming one. The colors in the back are fading and exotic birds and flowers are shown.
Friendship is a theme a lot of artists use in their paintings because it is source of great joy and great pain. Like love, it messes with our emotions and make us who we are.
The father of the Renaissance, Giotto, put it this way: ” The sincere friends of this world are like ship lights in the stormiest of nights.”