"Sand mandalas traditionally take several weeks to build, due to the large amount of work involved in laying down the sand in such intricate detail." "A sand mandala is ritualistically destroyed once it has been completed and its accompanying ceremonies and viewing are finished to symbolize the Buddhist doctrinal belief in the transitory nature of material life."
http://en.wikipedia.org/wiki/Sand_mandala
"Sand mandalas traditionally take several weeks to build, due to the large amount of work involved in laying down the sand in such intricate detail." "A sand mandala is ritualistically destroyed once it has been completed and its accompanying ceremonies and viewing are finished to symbolize the Buddhist doctrinal belief in the transitory nature of material life."