system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How did the spinning red, blue, and white barber pole get synonymous with barber shops?
gpt
Barbers way back in the day used to practice bloodletting (cutting to release blood) as a treatment for certain illnesses. The red represents the dripping blood. The pole used to represent that has stayed with the image of being a barber.