POLYGON WINDOW Surfing On Sine Waves (Very Rare 1992 UK limited edition 9-track double LP pressed on Clear Vinyl on Warp Records, the second release in the Artificial Intelligence series from Richard D James [aka Aphex Twin], including the dancefloor pounding Quoth single. This copy comes with the original five page press release and it has the low numbered sticker of 000025 on the front cover. The gatefold picture sleeve shows just a little edge scuffing and both discs look seldom played. This is the first copy of this version that we have seen! WARPLP7)