[0xEFF]

Printers and scanners have refused to process imagines containing certain patterns of stars for decades and it seems to have worked out OK.

[Teever]

No it really hasn't worked out 'OK' because here we are now.

[amarshall]

Could you elaborate?

[extropy]

I suppose GP is referring to https://en.m.wikipedia.org/wiki/Machine_Identification_Code And https://en.m.wikipedia.org/wiki/EURion_constellation

[sdan]

Printers recognize patters of stars on currency notes and will not print them and sometimes even notify the police.