It’s absolutely a skill, and teaching often helps you get better at it, especially if requires you to break it down and see it anew. I have the sort of brain (and always have, since I learned to code from a book and occasional RadioShack visits to type on a store TRS-80) where I can visualize code in my head. But that also requires understanding the pattern(s) and how to code.
All of these skills are intertwined…
I won’t teach you to code, there are many better teachers and videos and books. But a way to see how to see the task at hand, and ways to solve it, that’s helpful for all of us.
There are many ways to solve this task. I intentionally left it vague. And funny enough, a single random pixel is much harder than just randomly lighting a bunch of pixels, then lighting a new bunch, that’s a super trivial task, making static is both easy and “not art”. Focusing on a single one forces you to examine the elements in detail, and not shotgun it.