Method of operation
During operation, just hold the product left and right to gently shake it for a while to collect all the sand in the painting on the bottom edge, and at the same time, the fixed proportion of air inside will be shaken into small bubbles, and then it can be turned upside down horizontally.
and if you flip it over just right and get the bubbles lined up evenly across this thing, then the sand slowly sinks through a gap or two in the bubbles and can go for hours creating beautiful designs.
The quicksand occasionally freezes and the bubbles cannot float. At this time, you need to check the size of the bubbles. The bubbles should not be too large, preferably around 2mm. It is normal for individual bubbles to get stuck. The buoyancy of the bubbles is balanced with the gravity of the sand. , The probability of this problem, the probability of this situation is very small.