This is a stippled version of the famous photo of Albert Einstein taken by Arthur Sasse on his 72nd birthday. This stippled print is created by a small flying quadrotor that receives power from a tether. As such the ink soak sponge that is used for stippling can be refilled during flight by having the robot visit an ink cup, much like a humming bird drinks nectar from a flower.
Video showing tethered flight, ink sponge refill, take off and landing. A time lapse of the creation of the stippled Einstein artwork starts at the 1:10 mark.
This video produced by the McGill University newsroom provides a high level overview of the project.