The City That Changes Color When You Stop to Talk
Zyazysi built mats of living algae and set them at Kigali's street corners. They shift color with heat, humidity, and the weight of passing feet, pale cream in the quiet morning, deepening to blue-green when the markets open and crowds gather. Read across a whole day, they map the city's tide: where people move, where they linger, which corners become meeting places and at which hours. Neighbors read them aloud like a weather forecast for human life.
What surprised their maker was not the science. It was being wrong about her own street. A corner near where she works, one she had always thought emptied out in late afternoon, kept darkening. It made no sense until she understood: that is the hour people cut through from the other direction, and she had simply never been looking at the right time.
The mats that caught her longest were by a wall near Muhima, where three streets meet. There the color stays deep blue-green even after the foot-traffic has gone.
The mat was measuring not just heat and pressure, but lingering. The time people give to each other.
