I thought this was rather unusual. The artist Roger Hiorns took over a number of derelict bedsits in some flats near the Elephant And Castle. He sealed one up, knocked a hole in the floor of the flat above, and through it poured several thousand litres of copper sulphate solution. Then he waited for it to crystallise, drained off the remaining solution, and knocked a hole through into the flat next door. What was a derelict flat is now an art installation called `SEIZURE.' The Telegraph talks about it in this rather crappy and aimlessly pretentious vidcast or vodcast or whatever the damn things are called.