It is an eco-friendly weather forecast using stones.
It's fun.^^
a rainy day when stones get wet
When the stone dries, it doesn't rain.
When the shadow of a stone is on the ground, it's a clear day.
If there's something white on the stone, it's a snowy day.
A foggy day if you can't see a stone
A windy day when a stone shakes.
an earthquake when stones shake wildly
Tornado when the stone is gone.
LOL.