or make 4 interest-free payments of $1.75 AUD fortnightly with More info
The Rattleback is a science curiosity whose ancient and mysterious properties capture the attention of all ages. This little oddity has a natural spin bias and is a cylinder lens that magnifies vertically.
Rattleback will spin in one direction but when spun in the wrong direction, it will quickly stop, rattle up and down, and then begin to spin in the opposite direction. It also magnifies and is sure to entertain for hours!