This work is a psychedelic stereogram — a generative autostereogram that moves, rendered through a 2-pass GLSL shader pipeline at 1920×1080, 60fps, 30 seconds. Not a recording of something that exists; a mathematical function encoding 3D space into 2D wallpaper, decoded by human binocular vision in real time. No diffusion model. No training data. No stock textures. Every pixel is direct mathematical evaluation. The pipeline consists of two render passes: a raymarched depth field pass computing the hidden 3D scene, and a stereogram wallpaper pass encoding that depth into a repeating carrier texture using a SIRDS march algorithm. Both passes run as fragment shaders on a single fullscreen quad. Pass one raymarches the hidden scene via signed distance functions, 70 iterations per pixel. The camera sits at vec3(0.0, 0.5, 3.5) looking down the negative z-axis through normalized device coordinates. The scene contains two elements: a drifting landscape and a floating topological anomaly. The landscape is defined by dGround = p.y + 1.2 - fbm(p.xz * 1.5 + u_time * 0.15) * 0.4, where fbm is 5-octave fractal Brownian motion. The terrain undulates slowly, creating rolling hills that drift past the camera over the 30-second duration. The ground plane establishes the far depth reference. The floating topological anomaly is the focal object. It is constructed in three layers. First, the spatial coordinates are centered and lifted: q = p; q.y -= 0.1. Then hyper-rotations are applied: q.xz *= rotXZ where rotXZ rotates at 0.3 radians per second, and q.xy *= rotXY where rotXY rotates at 0.39 radians per second (1.3x the base rate). This dual-axis rotation creates a tumbling, gyroscopic motion. The trefoil-ish knot is built by computing the polar angle a = atan(q.z, q.x), transforming the radial-thickness coordinates tq = vec2(length(q.xz) - 0.55, q.y), then rotating tq by 2*a radians. The knot distance is length(tq - vec2(0.2, 0.0)) - 0.12. This produces a wrapped torus-like tube with trefoil symmetry. An inner solid core is added via dCore = length(q) - 0.22. The object SDF is the union of the knot and core: obj = min(dKnot, dCore). A gyroid membrane displacement is applied: gyr = dot(sin(q12.0), cos(q.zxy12.0)) * 0.025. This triply periodic minimal surface texture adds organic, cellular detail to the object's surface — the same geometry found in butterfly wing scales and self-assembling polymers. The final scene SDF is min(dGround, obj). Raymarching proceeds from the camera until the distance falls below 0.002 or the ray exceeds 7.0 units. The hit distance is normalized to depth via z = smoothstep(6.0, 1.5, t), mapping near objects to 1.0 and far objects to 0.0. Subtle noise is added to the depth itself: z += (noise(vUv * 15.0 + u_time*0.1) - 0.5) * 0.03 * z, making the wallpaper feel alive even in flat regions. Pass two encodes the depth map into a stereogram wallpaper. The algorithm is a per-pixel SIRDS march. For each output pixel, the shader walks leftward up

What's playing on the Silverlake stereogram?

ALT: Back In My Day Old People