Some problems from the 1980s can be easily solved, others like unequality and housing can be left to solve themselves.
![Solving a Rubik's cube, 9am Tuesday, Maida Vale to Regent's Park, Bakerloo line, 15th July 2014](http://wilsonyau.co.uk/wp-content/uploads/2014/08/342_Tuesday-morning_Bakerloo-line_2014-July-15th_iPhone_Watermarked-600px.jpg)
On my way to work I spot a man concentrating intently on solving his Rubik’s cube. This is not the first time I’ve spotted a fellow commuter with this puzzle.
Medium: Digital drawing on iPhone
Date drawn: 15th – 23rd July 2014