It's a letterbox that has a built-in motion sensor, dissolves in water and is powered by clockwork.
It's a series of randomly-generated product ideas! It raises questions about the nature of prior art in patenting issues, has some inspiring ideas, and is occasionally amusing.
Created in September 2002; now also available on Twitter with an updated 21st century dictionary. Royalty cheques should be made payable to Kevan Davis. More of this sort of nonsense at The Surrealist.