[minimaxir]

The original submission is likely using a ControlNet implementation. You don't need the special control_v1p_sd15_qrcode_monster ControlNet that the popular optical illusions technique uses: the common canny and depth ControlNets works fine.

When ControlNet first became mainstream I generated a fun series of tech company logo charcuterie boards using the Canny ControlNet and SD 1.5: https://www.reddit.com/r/StableDiffusion/comments/11bp30o/te...

Of course now with SDXL you can create very good ControlNet-constrained images.

EDIT: In another comment the OP confirms it uses an optical illusion ControlNet implementation.