I'll start us off:|
Silhouette Redux - You only see the shadows of the rider and track cast on to a large wall. It plays with perception as objects on the wall prove to be either part of the track or covering a gap in it. Not as annoying as it sounds thankfully. Find it in the RL recommended tracks.
I totally called it.
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Voted by the community "Best mod" 2011, 2012 and 2013.