Well, I'm a bit undecided here... think what I really love is diversity. I also like a good concept. I know it sounds a bit weird, *lol*, but a photo has to speak to me....
But... I have a thing for macro shots, and street photography... and black and whites ... and squares ...moody pictures ...architecture ...cityscapes ...night shots ...seascapes ... ... ... (in that particular order)
Other. I.e. conceptual. As I understand it at least. For me it often has to transport some kind of meaning or association. Remind of something. Hint towards something. It can in that sense be anything, either macro, architectural, still life, nude...
I chose other. My favorite thing to see in photography is old buildings or ruins that are being overrun by the local flora, preferably with water nearby. Its a very specific favorite. If ruins can't be had, then cliffs and rocks work just as well.
I think that in photography the most important thing is to catch the moment, no matter what it is- architecture, peoples faces, landscapes etc...You'll never get the same light, the same colours and the same moment! (My pictures are mostly spontanious ones and I thinkit is the best way to learn how to do it. )
I clicked "street" because I get a buzz out of it, but I enjoy all forms of photography. I've been away from it for a while, getting back to photography is a reawakening of sorts, even when I don't have a camera with me I'm looking for "the picture".
What can I say? I like them all... "Writing with light" as you so meaningfully demonstrated photography to be should be as diverse as writing with ink. And think of all that's been written with ink, from the bible to the one dollar bill!