I came across this typescale pictured below, and found the curve it makes to be quite satisfying in a way that reminded me of those "oddly satisfying" videos that go viral every now and then.
It made me wonder if there's a particular adjective that describes that feeling specifically? "Satisfying" feels a little too broad.
oddlywould be used as
unexpectedin which case
Serendipitous - occurring or discovered by chance in a happy or beneficial way.might be along the lines of what you're looking for.
oddlycould be used as
unexpected, I don't think serendipitous describes this particular scenario, insofar as I don't think chance was a factor.