Swimming pool with luminescent indicators

I think the current swimming pool design is not very friendly for people with limited vision. The lines at the bottom is totally black. As far as I know, it’s very hard to see black colored lines at the bottom, especially during the night. But if these lines are shiny, it helps to guide the swimmers. People can even choose the colour they want, having different patterns. I wasn’t able to implement it, but I made a prototype with clay (because it’s environmentally friendly, why waste resources for just an idea right?)