Practical answer
How do you use dark paint without making a room gloomy?
Deep colour made practical through task lighting, reflective surfaces and a clear purpose for the atmosphere.

Give the darkness a purpose, then build task, reflected and low-level light. Combine matt colour with timber, textile, glass or metal so the room remains readable even when the palette is narrow.
Start here
Choose the activity the darker atmosphere should support.
Use at least three light levels instead of one bright ceiling source.
Keep one visual exit or adjacent surface lighter.
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