My text editor.
For prototyping projects I usually start here when searching for parts- this or Jaycar.
A tiny little computer that’s a wizz at prototyping. Similar to Arduino. Pick either/or. Raspberry Pi has great educational resources and is an incredible organisation.
Anything is a button! A banana! Your cup of tea! Your fiddle leaf fig!
A hand tracking module for programming hand movements as an input, to control (kind of any) outputs.
A sensor to use your body as an input and matching it to magical output- like playing a musical instrument in the air.