The mechanics of tentacles

This image would be pretty obviously the work of Shirow Masamune (b. 1961) by style even if there weren’t attribution within the image itself. It is reblogged from a 16 January 2014 post at Infernal Wonders, and its origins on the Internet appear to go back to the now-defunct tumblr Random Forever Random, some of which is preserved in the Internet Archive.

Masamune has an official website here.