A Frida Kahlo painting sold for $54.7 million on Thursday, becoming the most expensive artwork by a woman to go at auction. The painting, called "El sueño (La cama)," or "The dream (The bed)" in English, is a self portrait by Kahlo. In it, she lays covered in vines on a canopy bed, with a skeleton holding flowers and wrapped in dynamite above her. Kahlo often painted pieces depicting moments of her life. After a bus accident at 18 left her confined to her bed, she often played with the ideas of