When I see something like this it makes me think about how a spreadsheet structure is "obvious" - but I mean it positively! It's a beautiful, intuitive, almost inevitable way to lay out data, and I'm delighted that folks came up with something like this so long ago.
I feel this way about a lot of my favorite posts on HN, whether they're a bit of history, a totally new invention, or something different entirely. And I certainly feel it here.