Cast metal versions of organic forms can look awesome, like this seashell that Seth Robinson made. The process involved placing a marlin spike shell into a sand mold. After melting aluminum and pouring it into the mold, he removed the casting and cleaned up the excess metal to reveal what the insides of the shell look like.
If you’ve been to a firing range, you’ll see countless shell casings littering the ground. Seth over at Robinson Foundry wanted to put these to use, so he melted down the brass casings and turned them into custom coins. He created the shapes by 3D printing coin models, then placed them into a sand mold for casting.
While most of the videos on the Internet that involve thermite end up destroying stuff, The Backyard Scientist decided to use the extremely hot concoction to fire a crucible for casting a sword. The result isn’t the most attractive looking thing, but still an effective weapon.