Regulation 77-A: Public Display of Unsanctioned Thaumic Markings The application of glowing, vibrating, or otherwise 'unstable' sigils to public property is a Class-B offense under the Arcane Peace Act.

Alistair’s Translation: 77-A is the Ministry's war on graffiti. Not just any graffiti, but the kind that starts fires or opens portals to the 14th century. They don't mind a 'Kilroy was here,' but they draw the line at 'Cthulhu is coming'.