Freerunner Jason Paul and friends got (a presumably large amount of) money from Red Bull to construct a building-scale Rube Goldberg machine that integrated several parkours at various stages of its operation, mixing the improbable action of inanimate objects with the improbable (and breathtakingly dangerous) actions of human lunatics.

Human-Powered Freerunning Machine - with Jason Paul (via IO9)

Photo: Chris Arnade

Chris Arnade is a photographer based in New York City. I've blogged his urban photography before. Check out these fantastic shots of young men in Hunts Point Bronx, doing crazy gravity-defying freestyle jumps. Below: more photos, and the story behind those photos, from Chris.—XJ

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Here's a "street skiing" video that crosses street-skating with parkour, driving a long-suffering pair of skis over a series of urban obstacles from stone stairs to snowy hills. Just watching this daredevil makes my heart pound in sympathy.

JP Auclair street.avi (via Kottke)