It's a common cliché of saying that Walker Evans photographed his subjects "frontally", i.e. that his lens faced the obvious front side of it. For e.g.:
However there's a problem with that with plenty of his pictures, for example, Church Interior, Alabama
Frontal to what, I may ask? To the wall? That's hardly the most important item here.
But there's one constancy I find (so far) among all his pictures: straight verticals. Absolutely none of his pictures that I know have crooked verticals. And that, I think, is a more constant stylistic choice than the so-called "frontality".
So here's my question: Who can show me a Walker Evans picture with clearly crooked verticals? A roll of Tri-X for the winner!