The sand can flow from the top to the bottom,and you can flip over it,then start again.

Sand painting is an ancient Chinese folk art with modern technology
Let hills and desert wonders gradually rendered on the eyes. Adjust your work stress and fatigue,
More exotic scenery on your office desk,gives you entertainment playing treasure,
Undulating hills, surging natural charm, may be able to cultivate your sentiment,
May be able to bring you a pleasant mood.

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