The quintessential FE argument is "if curve, why me no see?"
Thankfully I have a simple solution for this!
Open this link:
https://www.desmos.com/calculatorPlug this in:
((x)^2)+((y+1)^2)=1
Then plug this in:
y=0
Zoom in several times, eventually you will notice the two lines (one of which is flat, one is a curve) are indistinguishable.
BUT IF CURVED, WHY ME SEE FLAT?