Raised by radicals, Marxism is written through my friend like a stick of rock. Her annual Mayday texts may have beaming yellow emoticons, but the sentiment of her sloganeering is undiminished. Even so, I'm not sure her cross will go in the default box next week.

• On Kawara, May 1, 1987 (from the Today series, 1966-present), liquitex on canvas, 155 x 226 cm.