The next unique element is a helix, of which half is banked outwards, provides an odd tipping sensation, but surprisingly, no uncomfortable lateral forces.

Green Lantern Coaster

Green Lantern Coaster

17 December, 2011 by Gavin Seipelt

The next unique element is a helix, of which half is banked outwards, provides an odd tipping sensation, but surprisingly, no uncomfortable lateral forces.

In this photo