But for the purest engine experience, displacement has no replacement. All other methods are simply attempts to artificially recreate the benefits of displacement.
Seems some of the answers are baked into Siri:http://www.ft.com/cms/s/2/3bcbd2e0-f685-11e0-9381-00144feab49a.html#axzz1anCgIfcNKinda takes away the randomness, yet adds a layer a gaming to find hidden 'Easter eggs' I guess.