The heatmap is tracking whales accumulation or distribution behaviour by interpreting a reading of the formula:
"3d MA"(("Whales Balance"_"now" - "Whales Balance"_"-7d") / "Whales Balance"_"-7d")`
The warm colors on the chart represent net accumulation periods and the color temperature shows how much accumulation is taking place.

Conversely the cold colors represent net distribution periods and the color temperature shows how much selling is taking place.