It is awesome! The time and effort it must have taken when it would have been easier to build a simple bridge!
It kind of reminds me of a giant game of Mouse Trap.

Yeah its a classic. I loved Stewies version from family guy too.

http://www.stripeyhorse.ie/blog/?p=702

I admit that graffiti art is not meant to be taken too serious. But I also feel that removing a piece from the environment in which it was painted destroys all meaning behind it. This is especially the case for an artist like Banksy, the location of his works adds more meaning to them.