This is definitely a fun way to learn about magnetism, develop visual matching skills and improve hand/eye co-ordination.
Ring is magnetic, one side positive and the other negative.
When the rings are stacked they either attract the next ring (snap together), or repel the next ring (push apart or cause it to float) creating a space in the stack.
40 challenge cards for individuals to mimic by stacking magnetic rings.
Ages 3 years and up.