An “unbreakable” glass is a bit like an “indestructible” dog chew. And yet, here we have a bona fide “unzerbrechlicher Becher,” German for “unbreakable beaker.” The ultra-thick glass and armed prunts have successfully warded off clumsy hands for 370 years and counting.

Thick-Walled Beaker (Unzerbrechlicher Becher), German, 1643. Free-blown emerald-green glass with applied decoration and diamond-point engraving. The J. Paul Getty Museum