One frame at a time, with the camera on a rail, advancing toward a slit that has moving artwork behind it. And as a demo, [John Hess] makes his own slit-scan machine out of LEGO. You should really ...

He became OBSESSED with Lego after this. So much so that we built him a whole DIY Lego display shelf with book storage and an attached stuffed animal zoo. But until this point, he's done all of ...