Deep purple and bronze meet on a bolt that doubles as a mechanical puzzle. A spiral diamond lattice wraps around the threaded shaft, and two hexagonal nuts ride opposite helix grooves cut into the same piece. Twist the shaft and they travel in opposite directions at once.
Hold the bolt upright, grip one nut in each hand, and start turning. The left nut climbs while the right descends, then you reverse and they swap. The purple-to-bronze coloration shifts across the facets as the nuts pass each other. The quarter in the photo shows the scale.









