What is the secret to the burnt treasure map with the Polytron logo, the candle room, and the floating black monolith?

Question

After lowering the water level, there is a anticube room beneath the first warp zone. In New Game+ first-person view mode, the Polytron logo shows on the floor. After following the treasure map (standing exactly in the hole of the logo, entering the tetromino code on the reverse side), a floating black monolith/obelisk/pillar appears. What is the trick?

Asked by sean

Answer

Stand atop the square spot (denoting "1") and enter: ↓ ↓ LT RT RT A ↑

The black monolith will transform into a heart piece (finally), thanks to gregSTORM.

NB: To make the black monolith first appear, follow the burnt treasure map (or just stand atop the "0" hole and enter ↑ RT ↑ A ↓ LT ↑ ↓).

Answered by sean

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