That looks very much like the test pattern that would display on your TV screen when the station shut down for the night. Usually at midnight they would play the national anthem, and then you'd get a test pattern til the morning.
This was back in the olden days when things were 24/7.
@LiberalLibrarian @Museek
If only we could harness those survivor instincts for things like hurricanes and natural disasters. Sigh.
@Museek And yes, please don't bring the indigenous in on your claptrap, my dude.