There's probably several interesting ways to make a QR code on the ground with chalk. I'm thinking of a turtle bot loaded with spray chalk, for starters. And

There's probably several interesting ways to make a QR code on the ground with chalk. I'm thinking of a turtle bot loaded with spray chalk, for starters. And this post uses wire screen to make a stencil https://www.instructables.com/Simple-QR-Code-Spray-Paint-Stencil/ https://www.instructables.com/Simple-QR-Code-Spray-Paint-Ste...