Each rattleback has a mind of its own...
Some spin only clockwise, others only counter-clockwise. If you try to spin it the other way, it wobbles and starts spinning in the original direction!
Wood: Black walnut - Poplar - Sugar maple
Decorative assembly: rabbet
Pyrography: Celtic or Egyptian motif (specify your choice)
Dimensions: About 25 cm (10 in)
Spinning direction: Counter-clockwise
Rattleback with celtic rose:
The pyrographed rosette on this model evokes the harmony associated with the golden number (1,618...) that is often found in architecture and nature.
Rattleback with Horus eye (Oudjat):
The Horus eye symbolizes the quest for knowledge, a glimpse at the invisible. It is also associated with the history of mathematics.