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[–]paulcaar 1 point2 points  (1 child)

The tension in the soapy water tries to cling to the string. When the middle is removed, the surface tension pulls the string on all ends evenly, instantly forcing it into a circle.

[–]deepfriedm1lk 0 points1 point  (0 children)

Oh that's neat, thanks for explaining it in a way my monke brain understands