Follow this puzzle marker to a red button in upper Attilan.
Follow the outer wall left to a magickable orange-ribbed crate-thing.
Levitate to smash it, then levitate the components into place along the far wall (white outlines will show you where each one goes).
Without mounting the shield base tile, just toss a Cap Shield into the corner receptor to activate one-half of the brick locker.
Now heatbeam the nearby gold panel to reveal a shield bumper.
Note the shield base here. Go back and press the button you saw at the beginning, dash back to the shield base, and aim your throw at the newly de-golded bumper.
Do it quickly enough and you'll activate the other half of the locker, freeing your brick for acquisition.