Yup seeing the first picture at first I thought it would be some hack involving literal pizza boxes to do some ghetto build simulating good old... "pizza boxes" (the ones I fondly remember are the SGI Indy and then I guess the Commodore C128D qualifies too).

Nor about my circa 2003 gaming PC cobbled together from leftover parts from past builds, using copper wire to provide a common ground that pizza box cardboard cannot.