Ionian vs Lagoon

Both are Sherwin-Williams colors. These are both blues, so the question isn't which hue to choose — it's where within blue to land. With LRVs of 20 and 20, they'll behave almost identically in terms of how much light they reflect back into a room. They share a cool quality — useful to know if you're layering them in the same space. At ΔE 12.9, these are genuinely distinct colors — a strong contrast if used together, or a meaningful choice between two different directions. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.