Polyaka is made with 4 steel circles and 4 node keepers.
It is a beautiful fidget style puzzle that you solve for each symmetry: Binary, Triangular, Square. Twist the nodes and rings until you have different arrangements. (2 circles intersecting, 3 circles intersecting and 4 circles intersecting) The 2 and 4 circle solutions are demonstrated in the photos.
Circles have an infinite rotation group and can be made to do many different math-geometry concepts. The colored bar codes give you a way to explore different arrangements of the bars. Polyaka is very relaxing and not difficult.