A Black-on-Black “What am I?” Quiz

Nikon D4 + Nikkor 70-200mm f/2.8 @ 135mm — 1/320 sec, f/10, ISO 3600 —
map & image data — nearby photos

What am I?

besides, of course, very black

クイズ：何でしょうこれ
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It never ceases to amaze what one can find while putzing around the
mountain fringes of Kyoto. I came across this
today, and thought it might have potential as one of my “What am I?”
quizzes. What is it?

This one is probably pretty easy, especially if you look at the image metadata.

It brings to mind this quiz from a couple of years ago. I still use this related photo from that quiz's answer post
as the login-screen background for my Synology DS1511+ NAS unit;
the ultra-industrial feel seems to work nicely as a login screen.

As always, I'll keep comments hidden until I post the answer in a day or three.