I absolutely love these works, especially the first one. The vibrant colours and curves are reminiscent of 1970s exuberance, and the rainbow effect – the way the shades fade into each other – look deceptively simple at first glance, but I've no idea how he did that.
I love good grafitti. I used to walk past a site that was often covered in grafitti every day on my way to work. I used to take photos of pieces I liked, as I knew that they would get scrubbed eventually, and then more would appear. Some of it is astonishingly good.