"I am really interested in the 'non-object' or the 'non-material.' I have made objects in which things are not what they at first seem to be. A stone may lose its weight or a mirrored object may so camouflage itself in its surroundings as to appear like a hole in space," once said the artist Anish Kapoor of his signature monumental sculptures. The same applies to his latest work, a Bulgari ring in steel and pink-gold.