I think every moment of your life is ephemeral, because that moment with those exact conditions will never happen again. Because we in the North Eastern U.S. had our snowiest winter on record (and it is snowing again today for the 10th weekend in a row even though the calendar says it is spring), I have chosen all winter ephemeral images for the Weekly Photo Challenge.
A sunrise.
A sunset.
A Shadow.
Tracks on Snow.