a few weeks back i had exactly 10 minutes to spare before a meeting so i stood still and just looked at the big mound of sugar cubes (or whatever they are) in the Tate Modern. After a few minutes you start noticing some of the details, like how they big piles 'spill' on to the building structure, and how some of the piles have order.

after a while it nearly turns in to a Where's Wally book of obscure angled blocks. "where is the slightly crooked up-ended one" etc