Use TURBO mode to see the demonstration pattern. (Press the <Shift> key and click the Green Flag for TURBO mode). The "1 Line Challenge" is to produce an interesting pattern using only ONE line of code to calculate the color of each pixel.
Original idea from @LucasCool34 (I didn't copy their code or anything. Just the idea of a Pokéstop.) Look, I KNOW I'm like a year late on this. But I just remembered that this challenge existed so I looked it up and saw @LucasCool34 's project and thought "Oh that seems cool, I wanna try that." I basically just used a bunch of and, or, < and > blocks. It was a lot of trial and error, so the code might be a bit messy.