What happens when you feed AI nothing

If you stumbled across Terence Broad's AI-generated artwork (un)stable equilibrium on YouTube, you might assume he'd trained a model on the works of the painter Mark Rothko - the earlier, lighter pieces, before his vision became darker and suffused with doom. Like early-period Rothko, Broad's AI-generated images consist of simple fields of pure color, but they're morphing, continuously changing form and hue.

But Broad didn't train his AI on Rothko; he didn't train it on any data at all.