Here is a video and recipe with these plates.
I bought these place at a flea market, that does not longer take place in Berlin. It was a small cute market in a urban garden setting. Mainly just people from the neighborhood coming with a couple of boxes of private stuff they no longer need. Mainly clothes and household items. So I got these modern plates a couple was selling for around 25€ if I remember correctly. Unfortunately, I didn’t find out who these are by. It was an artist from Hamburg I remember them saying. Hope I find out who made those.