(181007) -- HOUSTON, Oct. 7, 2018 (Xinhua) -- Visitors view the interactive "moonGARDEN" exhibition at Discovery Green park in downtown Houston, Texas, the United States, Oct. 6, 2018. (Xinhua/Yi-Chin Lee) (wtc)more(181007) -- HOUSTON, Oct. 7, 2018 (Xinhua) -- A woman takes a photograph with a "moonGARDEN" sphere with urban scenery shadows at Discovery Green park in downtown Houston, Texas, the United States, Oct. 6, 2018. (Xinhua/Yi-Chin Lee) (wtc)more