A concept of landscape architecture and site design involves the acknowledgement of desire paths, those etched remnants of the accumulation of thousands of footsteps over a particular planted area. While often this idea is used to determine the future location of pathways - there are millions of urban 'desire paths' that are created by the innate need to follow the path of least resistance.
:: image via vulgare
:: image via HKW
:: image via Yamashita+Kobayashi
The idea is much more impressive in video, such as the one on their site, or this YouTube version here. Looks like a good workout as well.
Thanks Thomas from VULGARE for pointing this one out...