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This is an engaging 404 page really awesome

Heron runs inside Revit, Rhino, ArchiCAD and SketchUp, so the site had to read as an instrument rather than a brochure from the first frame.

The preloader replaces the progress bar with a drawing in progress. A red datum line moves up an architectural elevation carrying the percentage value, and the building is drawn in line by line as loading completes. Supporting information sits in the margins in the same register: live cursor coordinates, a project spec card covering type, founding year, focus and location, and a numbered system boot sequence.

Functionally it covers asset loading for the interactive hero, so the drag-to-reveal behaviour responds immediately once the page lands. Editorially it sets the frame before a single line of marketing copy appears.

Using the loading percentage as the literal height of a red datum line on the elevation is the kind of detail that only works because the product is actually for architects. It reads as instrumentation instead of decoration.