120 animal photographs as centered points in two coordinates. Drag the left panel (or use
← →) to rotate a unit direction w. What the direction keeps and what it leaves over trade off;
their sum never moves. One angle leaves the least.
°
Centered points
What this direction keeps
The two always add to the same total
projected variancereconstruction errortotal
Data: 120 A1 animal photographs (left/right half means; mean intensity vs RMS contrast;
two neighboring 64×64 pixels). Numbers computed in the browser from the centered points — Escape exits when embedded.