Drag anywhere (mouse or finger) to orbit the cloud. Drag the small crosshair at the center to pan your gaze sideways and up or down.
Focus
The slider at the bottom sweeps the focal plane through the cloud. The scroll wheel does the same.
Reveal
A letter resolves when it sits near the crosshair at screen center and on the focal plane. Off to the side or out of focus, it dissolves into a warm bokeh disc.
Goal
Align so the word's letters resolve in order, front to back.