I'd say it's a bit more involved than a single command stream: you can include any number of nested lists inside the outermost list, and each list acts as its o

I'd say it's a bit more involved than a single command stream: you can include any number of nested lists inside the outermost list, and each list acts as its own self-contained scope for configuring the style. For instance, if you write Graphics[{Red, Disk[{-2, 0}], {Green, Disk[{0, 0}]}, Disk[{2, 0}]}], you'll get a green disk surrounded by two red disks. Often, when I'm constructing a long Graphics call, I won't have any commands at all in the top-level list, but instead put each part in an isolated sublist.