Teachers and administrators at commencement place their tassels on the left. Traditionally, the moving of the tassel at graduation is called, turning the tassel or the turning of the tassel ceremony.. It symbolizes one's transition from candidate to graduate.
Bailey, D., Bailey, S. & Hufford, M. (1996) Copperheads Smell Like Cucumbers. [Audio] Retrieved from the Library of Congress, https://www.loc.gov/item/cmns001450/. Bailey, Dave, Sherman Bailey, and Mary Hufford.
Copper has a similar effect, accounting for the metallic smell created by handling coins made of copper alloys. When a shopkeeper hands you a coin, says Glindemann, you're smelling his body odour..