We cut a portal to hell into the floor of the Gregangelo Museum.

First site visit. The house announces itself with a striped circus-tent roof and a weathervane; inside, decades of obsessive making: a bathroom mosaicked into a glowing reef, corridors hung with painted canvas and gilded mirrors. The museum wanted one more impossible room: look down, and fall forever. Our job was to make that promise real, and keep every cable, cut, and controller invisible, with installs squeezed around live tour windows.

Before cutting into anyone's floor, prove the magic on a desk. I flashed an ESP32 and started from the classic Fire2012 flame simulation, then rebuilt it around Perlin noise for smoother, more organic motion, tuning ember decay on a flexible 8×32 WS2812B matrix until it read less like RGB confetti and more like something burning far below.

The first piece went in at the end of a candle-lit corridor draped in painted canvas: a keyhole-shaped infinity window, one-way glass over mirror, ringed with addressable LEDs. Stand close and the tunnel recedes through the wall, through the house, into somewhere the floor plan insists doesn't exist.

May was the unglamorous middle: LED panels chained and addressed across the studio floor, hundreds of joints soldered flat on cardboard, floorboards cut open between joists, power and data snaked past the house's copper plumbing, controllers taped into wall cavities where no visitor will ever find them. Working inside a finished artwork means measuring three times before every cut. There is no drywall to hide behind. And when the animations started glitching, we chased ghosts until the culprit turned out to be voltage drop over one long cable run, fixed with a beefier 5V supply, short thick ground returns, and power injected right at the pixels.

Once the mirrored walls rose, every session ended the same way: lights off, standing inside, checking which illusions held. The firmware grew into a scene system: fire, ambient pulse, and a twinkling starfield whose drifting stars 'snaked' down the serpentine-wired rows until I rebuilt the coordinate mapping to let them glide. Half-built, the spaceship window already refused to look like a room.

By July the chamber was sealed: mirror on every plane, mosaic crusted over the seams, the firmware running its slow loops. The museum now folds it into guided tours as one of its mystery rooms: visitors step in, look down past their own feet, and watch the bottom of the house fall away into blue. The reaction is always the same: a short silence, then someone laughs. A next phase is already sketched: projection-wrapped fabric walls and camera-based motion tracking, so the portal can answer back.