 He is perhaps best known for dealing with the elusive concepts of memory and perception through light installations.After measuring with a colorimeter the light that exist naturally in a specific place and time, Finch's re-constructs the luminosity of the location through artificial means.For example, Moonlight (Luna County, New Mexico, July 13, 2003), replicates the exact light of the full moon that shone over the desert of Luna County, New Mexico on the evening of July 13, 2003.