The present invention provides a toroidal structure comprising a plurality of closed-loop toroids interconnected together, each toroid having a body defining an interior, the toroidal structure comprising: a first toroid of the plurality of toroids having a first proximal portion and a first distal portion; a second toroid of the plurality of toroids having a second proximal portion and a second distal portion; and an interconnection between the first and the second toroid formed by looping the first proximal portion around the body of the second toroid and passing through the interior of the first toroid adjacent to the first distal portion to cause the first distal portion to be positioned adjacent to the second proximal portion.