Freedom from adulteration or contamination; a good dose of purity is hard to come by in life these days. The ferns and foliage of the forest is a great place to start looking, but never at the races. Course poles, race tape, fluorescent marshalls, super fans with chainsaws and ticking clocks. All these visual and auditory distractions take away from the solitude and sanctity of the trees.
So how about just man and non-motorized machine alone in nature? Say Remi Thirion drifting down a ribbon of dirt in steep terrain, under a canopy of birch and conifer. No lift overhead, no hard-pack below; simply a rut in the loam, some small berms and a few tricky obstacles. Just enough for one of the most humble yet highly venomous riders to sink his teeth into. That would probably be neat.