Quiet, skeletal, deeply strange. D2 Sketches 2 is the original 1999 companion disc to D2 on Dreamcast, and it treats music like sculpture. "Main Theme (Piano Version)" is haunting in the most literal sense. The rhythm sketches act as bridges, tiny percussive interludes that break up the longer color themes.
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"Sketch #7 ~ Theme of 'Gray'" sits in this uncomfortable middle ground between calm and dread. Each color theme carries its own weight. White feels open. Black feels final. Kenji Eno was composing atmospheres more than songs, and the Dreamcast era gave him the space to do it.
If you want to hear what happens when a game director treats a soundtrack like an art piece, start here.