The first time I ever saw something like this was a program called Tempest for Eliza, which would generate patterns on a CRT screen that could be captured by an

The first time I ever saw something like this was a program called Tempest for Eliza, which would generate patterns on a CRT screen that could be captured by an AM radio. The website appears to still be available at: http://www.erikyyy.de/tempest/ http://www.erikyyy.de/tempest/