Pick a colour before you leave the house. One colour. That's your constraint for the session. Find it in clothing, signage, vehicles, shop fronts, food. Photograph it wherever it appears.

The discipline is in noticing. A red umbrella in a grey crowd. A yellow door in a brick terrace. Green wellies at a car boot.

Watch for: colour repetition in a single frame - two people in the same colour who don't know each other. That's the shot.

The point: constraints make you look harder. Colour is everywhere once you're tuned to it. This exercise rewires how you see a street.