Putting serrations on a blade by hand

Stair dust corners introduced at the end of the 19th century to make sweeping easier. They keep dust from accumulating in the corners.
https://redd.it/1cbe5nd
@r_designporn

This open-closed gear signboard
https://redd.it/1byota9
@r_designporn

Advert for Pakistan International Airlines (PIA) 1979 NYC
https://redd.it/1b7e3t3
@r_designporn

Bruh

Me and who
#gorilla