Amazing stuff.
There must be another artist doing somewhat similar impermanent works. He creates his by walking a pattern in large snow fields. I forget his name, but I saw a documentary not long ago about his patterns.
I'm pretty sure it wasn't Amador, because I see no snow scenes on Amador's web site.
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I found a piece about the snow walker. His name is Simon Beck. You can see some of his work by Googling "footprints in snow artist" and clicking on "Simon Beck."