See how this grid folds into a parabola.

More Parabola information in “owners manual” format by Michelle Tat.

We laser cut the holes in the cardstock and added some laser etched lines to make the folds crisp.  Find the laser files here.

This thing is a great fidget and you would be surprised at the tenacity young children and even adults to string the whole grid and adjust the tension till its just right.