Here is a cool video by Amy Makes Stuff showing various laser cut flexure mechanisms: https://www.youtube.com/watch?v=YEz-r8KDY-0
Flexures are compliant (i.e. soft / movable) elements that provide some motion. Compliant mechanisms are really interesting and useful for a variety of applications (See https://youtu.be/97t7Xj_iBv0 for a good primer).
While these are laser cut, flexures can also be made using other processes like waterjet and 3D printing. The Round Flexure Switch uses a 3D printed flexure to provide movement of the button.
For a more technical discussion, Amy has a lecture here: https://www.youtube.com/watch?v=K0wr_ZhhtbE
BYU has a research group studying and designing these types of mechanisms. They have a number of example models that are free to download: https://www.compliantmechanisms.byu.edu/maker-resources