Cosmos vs Rhythmic Blue
Both from Sherwin-Williams's palette. These are both blues, so the question isn't which hue to choose — it's where within blue to land. Rhythmic Blue (LRV 69) reflects noticeably more light than Cosmos (LRV 38), a difference of 31 points that becomes especially apparent in rooms with limited natural light. Both lean cool, so they'll behave similarly in mixed or changing light conditions. With a ΔE of 20.7, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Cosmos vs Rhythmic Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Cosmos on one side and Rhythmic Blue on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Cosmos comparisons
See how Cosmos stacks up against other well-photographed colors across different brands and tones.
