17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

If you’ve spent any time lurking on Reddit’s mildlyinteresting, interestingasf*ck, or damnthatsinteresting subreddits, you’ve seen them: those 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 pictures of this kind, from Reddit and beyond. Vote up the ones that blew your mind at least a little.

A Bricklaying Machine

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

How a Log Is Divided Up

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Moving a House in 1908

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

The Inside of a Bowling Ball

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Changing Lightbulbs in an IMAX Theater

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Noodles in Taiwan

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Harvesting Carrots

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Episode V’s Opening Crawl

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Maintenance on a Scary Bridge

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Strips of Bark with Corks Punched Out

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Cleaning Lincoln’s Ears

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Inside of a Cheap iPad Case

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Forming Springs

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Making an Ice Rink

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

De-Icing an Airplane

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Inserting a Doll’s Eye

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”

Scoreboard Maintenance

17 Pictures That Will Make You Say “Oh, That’s How They Do That!”