There's something I really love about technology that's so much a part of infrastructure and daily life that we don't even recognize it for what it is.
Concrete is probably my favorite example.
@Felthry gosh that one is so fundamental it's even faded into the "assumed" category for me :)
@starkatt Tools in general, like the abstract concept of using something that isn't part of you to do a thing
@starkatt How about agriculture, too?