My officemate Paul Heckbert wrote a ray tracer in PostScript after we realized that the laser printer's processor was much more powerful than our "real" compute

My officemate Paul Heckbert wrote a ray tracer in PostScript after we realized that the laser printer's processor was much more powerful than our "real" computer. As you might expect, the interpreted PostScript ray tracer was extremely slow but it did eventually generate an image, I think at 32x32 resolution.