The latter, I think, for most of us. But there's a disorder called alkaptonuria that causes a developing agent related to hydroquinone to be excreted in the urine: see http://www.cmaj.ca/cgi/content/full/172/8/1002, a case study that includes a portrait of the patient developed in his urine.
Hence the old curse - 'May your children piss port wine'.
George III had it. Could you ask him to accompany you to this island?
So far nobody has ground a lens - or are we using a pinhole camera?