A corridor as a colour course
The underpass under the ring road moved eleven thousand people a day through 120 metres of sodium-lit grey. The commission asked for "art"; the site asked for colour theory. The walk is now a sequence: a red zone that visually compresses the wide entry hall, a long yellow run whose diagonal stripes accelerate the monotonous middle, and a blue vault at the far stair that reads as arrival — depth, calm, sky.
The theory is old classroom material: colours advance and recede, warm hurries, cool settles. What the classroom never had is a control group of eleven thousand commuters. Pedestrian counts show fewer stalls at the entry pinch; the transit authority's surveys stopped listing the underpass among "avoided at night" locations within a season.
Paint is a schedule
Public colour fails by fading, not by vandalism. The palette is specified in mineral silicate paint with published repaint intervals, the city crew got a colour book with mixing codes, and the budget line everyone fought for was not the mural — it was the maintenance contract. Colour that stays is the artwork; colour that fades is a complaint.