How can I visually determine whether a 2D vector field has curl?

How can I visually determine whether a 2D waifu has a cunt?

If there's net clockwise or counter clockwise motion. Patterns 1 and 3 have curl.

By looking at it.

>>8002859
this

>>8002849
Make sure it is a qt loli

File: Wholesale-font-b-Paddle-b-font-font-b-wheel-b-font-font-b-boat-b-font.jpg (73KB, 800x800px) Image search: [Google]

73KB, 800x800px

Picture a paddle wheel in it.

If it spins, you got curl.

>>8002859
But pattern one has no net motion

>>8002933
Imagine the arrows are water flowing. If you stand in the middle, extend your arms, you're gonna start spinning. You'll spin everywhere in this vector field, but you'll at least be able to stand still in the center.

>>8002830
Literally this>>8002923

Curl is just how much a vector field will make something twist

>>8002933
Do you not understand torque

Imagine there is a rigid body inside as Paddleman says and if it has a net moment then it has curl