Stack (1975) Tony Cragg
A beautiful sculpture by Tony Cragg, a Turner prize winner. He has created such a pretty cube out of natural and man made material similar to geographical formation.
Conceptually, looks like he is trying to convey a message that this is what the geographical formation has changed to by years of deposition of waste.
Seeing this reminds me of an assignment in my college days, where we were asked to create a sculpture from metal waste. The assignment was fun and one of my favourite ones.