I’ve been working on a tool that will let me visualize the PDCCH resources in NR, and I will show and discuss some of its features in this post. I’ve always thought that one way to understand something is to program a computer to do it. In the job of doing that, I typically find out gaps in my knowledge or even more so, areas for which I had only a superficial understanding for - ““The best way to understand something is to teach it to a computer” [1].