A series of enigmatic signs popped up around the Mission this week, carrying warnings of “angry alba tross” and dangerous air molecule crossings.

The notices, which appear to be an art project, are made of metal and are bolted to various telephone poles and streetlamps. The work spans a range of emotions, veering from a plaintive request of Mother Nature to “rain now please” to the wonderfully confusing “rage make paper.”

The top pictured sign is on the corner of Florida and Mariposa Street, while the bottom photo was taken at Alabama and Mariposa Street.