One theme taken from the article is that, for the most part, practice came before theory. Only later were likely (and even unlikely) explanations given for the

One theme taken from the article is that, for the most part, practice came before theory. Only later were likely (and even unlikely) explanations given for the practice. I think the turning point between practice/theory could've actually happened within the 20th; black holes were thought to exist using available data and were then later discovered.