Fiber optic ... like swimming pools. “You can now have a light source in some area of your yard and pump light into a cable terminating in the deep end of your pool,” says Steve Keplinger ...

Back then, a swimming pool was basically a glorified cement ... Ron Gibbons, installed 2,250 fiber-optic lights to the black bottom of the pool, giving the illusion of a night sky.

Nope, it's because your backyard swimming pool is likely painted ... If you look at a fiber-optic cable, the ends look bright because light can enter the sides but only exit through the ends.