If you’ve spent any time lurking on Reddit’s mildlyinteresting, interestingasf*ck, or damnthatsinteresting subreddits, you’ve seen them: those pictures that make you slap your forehead and go, “So that’s how they do that!” They’re pictures that give you a behind the scenes peek at how common things function, are assembled, or are maintained.
Below are just some of the most interesting pictures of this kind, from Reddit and beyond. Vote up the ones that blew your mind at least a little.
A Bricklaying MachinePhoto: Metaweb / GNU Free Documentation License31,7774,581Is this fascinating?
How a Log Is Divided UpPhoto: Metaweb / CC-BY34,1555,607Is this fascinating?
Moving a House in 1908Photo: Metaweb / GNU Free Documentation License24,9495,469Is this fascinating?
Changing Lightbulbs in an IMAX TheaterPhoto: flickr / CC021,2705,565Is this fascinating?