a table of a knot shaded with different materials including aluminum, brass, bronze, copper, electrum, gold, iron, pewter, silver, clay, foil, glaze, plastic,  rubber,  satin, and velvet. created in Mathematica 13.1
<a href="//commons.wikimedia.org/wiki/User:WalkingRadiance" title="User:WalkingRadiance">WalkingRadiance</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>