The mazzocchio was a part of 15th century Italian headgear. It was also a kind of final exam problem for students of perspective. Painted by Uccello, drawn by Leonardo, incorporated into intarsia and prints through the 16th century, it still appears occasionally in 21st century art. Here we review its history; show 3D models made by hand in wood and using stereolithography in plastic; and report two novel visual effects seen when viewing the 3D models.