Field guide No. 622

In a mountain valley an avalanche roars down on the left and ends in a perfectly straight vertical edge, while on the right the slope is calm and untouched. Somebody put up a sign, presumably.

Avalanche against an invisible boundary

Snow, stopped at the door.

In a mountain valley an avalanche roars down on the left and ends in a perfectly straight vertical edge, while on the right the slope is calm and untouched. Somebody put up a sign, presumably.

Field noteSnow slides until it runs out of slope. This lot stops dead at a line nobody can see, sheared flat like a cut cake.

Specimen
No. 622
Kind
Possible (the golden mountain kind)
Breaks
Physics
Where it doesn’t exist
An alpine valley, half of it quiet.
Nearest existing relative
An avalanche.
Filed in Fresh slop as
Spaces

Also possible, also breaking physics