Tokihiro Sato uses a small flashlight at night (or a mirror during the day) to make pinpoints of light that chart his movement through space. On a couple of occasions he has worked within snowscapes.
Photo-Respiration #155 1992
Hattachi # 346, 2000Gelatin-silver print or black and white transparency over light panel
Sapporo 1, 2001, Gelatin-silver print or black and white transparency over light panel
more works by the artist can be seen here