HOUSTON (KTRK) -- A group of Atlanta-based Tibetan monks who appeared on Netflix' "House of Cards" were in Houston this weekend, creating a sand mandala at Asia Society Texas Center The monks from Drepung Loseling Monastery in Atlanta, Georgia, worked for four days through Sunday to complete the artwork.Sand mandalas are a Tibetan Buddhist tradition involving the creation and destruction of mandalas made from colored sand.The completion of the artwork was on Sunday with a closing ceremony in which the artwork was destroyed by the monks to "enact the impermanent nature of existence by sweeping up the colored grains and dispersing them in flowing water," according to information about the practice on the Smithsonian website.