Limbo the dirt-powered robot vacuum cleaner unearthed - photo 1Limbo the dirt-powered robot vacuum cleaner unearthed - photo 2Limbo the dirt-powered robot vacuum cleaner unearthed - photo 3Limbo the dirt-powered robot vacuum cleaner unearthed - photo 4Limbo the dirt-powered robot vacuum cleaner unearthed - photo 5Limbo the dirt-powered robot vacuum cleaner unearthed - photo 6