Aphex Twin is easily one of the most influential electronica artists ever, and this album is easily one of the most influential IDM albums ever, and is easily one of Richard D. James' best. Despite the name (which implies it is ambient), this album is pure IDM at its best. Much more consistent but less evocative than S.A.W. Vol. II, it's regarded by many as his best, and although I wouldn't feel completely confident saying the same, it is one of his best.
Richard D James has a way with producing such bizarre sounds that never cease to boggle the mind, and his first LP is him at his smoothest. Standout 'Green Calx' blows my mind every time I hear it, while 'Ageispolis' has the perfect amount of reverb. Every track on here is such a weird assortment of strange noises that are so original and manage to resonate each and every time I hear them.