Three-year-old Laurent Schwarz may still be wearing nappies but his paintings have earned him social media fame and the nickname of Germany's "mini-Picasso".
In 1916, the photographer Alfred Stieglitz mounted 10 of Georgia O'Keeffe's charcoal drawings at his avant-garde Gallery 291 in New York. The 29-year-old O'Keeffe had arrived. That same year, a 19-yea ...