The moment he clicked “Apply Archiglazing,” the screen flickered. For a heartbeat, the monitor showed not polygons and vectors, but something like a timelapse of frost spreading on a windowpane. The cursor turned into a tiny glass prism.

Elias opened one eye. On the corner of the screen, a tiny counter had appeared: “Debt: 3 hours of sunset light. Payment due at final render.”

For ArchiCAD 16 only. “Let the light decide.”

“What… what tool did you use?” she asked.

In the autumn of 2012, Elias Voss found himself staring at a curtain wall that would not bend.

Then the model rebuilt itself.

He didn’t remember installing it. Had it come on a forgotten CD-ROM? A gift from a long-retired BIM consultant?

“It’s impossible,” his junior partner, Lea, said one rainy Tuesday. “We have to rebuild it in Rhino and just fake the drawings.”