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The taste map: a 2D embedding of everything the user has heard, with posterior utility attached — taste rendered as territory (islands of glow across patch space) rather than a single preference vector.
The projection is plain PCA over standardized features (top two principal axes by power iteration, deterministic start), computed over the union of the current pool and the observation history. Pool points carry candidate ids (clickable in a frontend); history points are ghosts — patches that may have been evicted, kept to show where the user has traveled.