2022-03-04|Sunatori's Spontaneity (Stained-Glass Ice Formation)

Here is mysterious spontaneous ice formation on top of a patio stone which has a grid pattern with pi/4 radian (90 degrees) angles only.
The stained-glass pattern turned out to be due to snow accumulation on top of partially-melted cracked ice, as revealed after snow melt.
Here is a cracked ice surface that my geological engineer/exploration geologist daughter Évelyne captured.