Derek Lowe discusses this paper: <a href="https://www.cell.com/current-biology/fulltext/S0960-9822(23)00826-6" rel="nofollow noreferrer">https://www.cell.com/current-biology/fulltext/S0960-9822(23)...</a><p>Basically, people unable to see color due to a genetic mutation were given gene therapy. They still couldn't "see" the color but they could sense it was there.