It's been said that there is nothing new under the Sun and I guess that's true, but I marvel that he pursued his line of artistic exploration as early as he did, and as pointedly as he did.
Many of his photos are even stronger than the ones I have shown - by that I mean more subtle, lyrical, powerful, mysterious, dazzling, etc. - but it's impossible to convey their impact with the reduced size and resolution of a computer monitor. I recommend the book Aaron Siskind 100 very highly: the images are large and the reproductions are very good. (I was able to borrow it through an inter-library loan.)
I should also point out that it's very hard to choose a small number of photos from someone's entire opus. For example, with Merg Ross, I had to show 3, because his style is so varied - and even then I didn't really scratch the surface. With Sandy King, again I had to choose something that shows well in reduced size: much of his work is vision on a grand scale with fine details.
In the final analysis, photographers don't really have a style per se: just a collection of masterpieces.