As Henri might have said: great geometry!
It's another of those shots that viewed as a thumbnail, makes a wonderful shape, but by the time I click it to expand it, turns out far too big for my iPad to handle and is immediately reduced to sections at a time. I have no Ctr - or + with which to follow the good advice given by Eric and others. Put another way, if I do, I have no idea what it may be.
:-(
Rob