A four-dimensional hypercube rendered as pure vector glow: all 16 vertices are spun by three simultaneous 4D plane rotations (XW, YW, ZW), perspective-projected 4D→3D→2D so the inner cell swells forward as it turns toward the viewer, and the 32 edges are rasterized as line SDFs whose brightness and hue are cued to their depth in W — cyan when they push toward you, magenta as they fold away. Scrolling drives the rotation speed, the cursor steers the YW/ZW planes to tumble it by hand, and holding the pointer engages a second XY rotation so the projection knots through itself.