A Do-It-Yourself Christmas tree made of discarded food containers by the crew of Skylab 4, astronauts Carr, Gibson and Pogue, during their 84-day mission on the US space station Skylab between November 1973 and February 1974. Other DIY activities – from rigging equipment for practical jokes, or para-utilising onboard materials to hack and tinker – have been part of the limited off-duty time of astronauts and cosmonauts until today. They appear to instill a sense of flow and enjoyment for the user, and playful modification of onboard items often result in insightful scientific experimental set-ups or enhanced hardware. (Image: NASA Johnson Space Center Collection).