Illustrator’s note:

“Unlike the Duel Terminal case(s), this is one of those case(s) where a basic concept is used first, and then the series progress over time. I wanted to introduce a recognizable [symbol/emblem], for this portmanteau of ‘Metal’ and ‘Metamorphose’, for Psychic-Types. And of course, the idea of spoon bending just wouldn’t leave me alone. I figured that if I could turn this goofy idea into something cool, a new design could be born…or at least that was the kind of energy I had while thinking about it. It was great at first though, because if you just straddle on [a spoon] it already looks like a motorcycle…thus began a long penance.”

Translation via YGOrg