During a trip to Edinburgh in August, I came across the work of Sol LeWitt (1928-2007) for the first time. This was at the Scottish National Gallery of Modern Art. Amongst other pieces, I was able to see 'Five Modular Structures (Sequential Permutations on the Number Five)'. What is not immediately obvious - but which makes these structures particularly interesting when one knows this - is that they all have the same 'footprint': they take up the same two dimensional outline and space on the floor, yet are each quite different given the addition of the third dimension.