Some designers lean into colour, others are more pared-back, some like to take their palette's lead from artworks, others from rugs. Some are relatively universal: rules that are bound by form, light, colour and space. We trawled our archives and asked interior designers to open up their rulebooks to find out. Try paint colours at different times of the day and night and in different areas of the room. Think of paint as a backdrop and reserve your bold colours for furnishings or artwork.”“Don’t think you can choose a wall colour remotely.