We hear a lot about the importance of practicing social distancing these days. Not everyone keeps the required distance from others though. This Social Distancing Laser Hat by Stupotmcdoodle takes the guesswork out of the process. It marks your personal space by drawing a circle with a radius of 2m around you.
You are going to need a 1mW Class 1 laser, 3D printed parts, 1 x motor, and a few other simple parts to put it together. You can read all about it on Thingiverse.