I build a computer app to make it easier to do projector sewing. This allows you to take a PDF sewing pattern and use a projector (often mounted on a ceiling, shining down on a cutting mat) to see that pattern at life size. You can then easily cut it out and sew it together.
I do think it has uses beyond sewing; enlarging art, for example, or perhaps painting stage backgrounds, or maybe laying out patterns for building something out of wood.
My app is called Project&Cut and can be found at https://projectandcut.com.