Sounds like synesthesia ( <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Synesthesia" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Synesthesia</a> ). People with synesthesia tend to associate colors with numbers or similar. Often it&#x27;s extremely specific colors, like &quot;deep electric purple with sparkles&quot; for 125. These colors can be consistently identified and described across multiple tests, suggesting that the person actually maintains a consistent inner representation of numbers in terms of color.<p>Associating colors with days of the week is another well known example, described in the book &quot;Wednesday is Indigo Blue&quot; ( <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Wednesday_Is_Indigo_Blue" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Wednesday_Is_Indigo_Blue</a> ). You might find it interesting.<p>I only know about this because I had a friend in middle school who was a synesthete. We thought he was making it up until we gave him a list of (long) random numbers to describe the colors of. We then mixed up the order and gave them to him a week later and he provided consistent descriptions. It was pretty cool actually, I&#x27;ve always been a bit envious.