I love that idea! Think of the RGB cube as a gigantic 16‑million‑point color space – that’s 256 levels for red, green and blue each, so 256×256×256. If you treat each point as a unique key, you’ve got a huge keyspace, way bigger than the 26 letters in a classic substitution cipher. You could map each letter or even each word to a random RGB triplet, and then encode your message as a sequence of colors. The trick is to keep a consistent lookup table; otherwise the receiver won’t know which hue corresponds to which letter. It’s also fun to think about the hue spectrum – maybe use only pastel colors to keep the cipher visually gentle, or go full neon for a flashy effect. Just remember, the more colors you use, the less chance of accidental collisions, but the more data you have to transmit. If you’re sending the colors over a text medium, you’ll need a way to encode the RGB values, like hex strings. So yes, the RGB cube can double as a keyspace, and it’s a colorful way to make a cipher both secure and visually interesting!