Borromean rings
A three-components knot. The three threads are mutually untied (all the possible couples of components of the knot are untied), but the resulting knot isn't untied.
This image has been realized with the computer program KnotPlot.
© matematita
The image belongs to the sections...:
Three or more components knots (Topology)
Further information:
http://www.pims.math.ca/knotplot/
