Night of the Creeping Tree

(From Caspar David Friedrich, via The Yorck Project and Wikimedia Commons, used w/o permission.)
Caspar David Friedrich's "Man and Woman Contemplating the Moon."

Is it just the Lemming, or was that tree moving a moment ago?

Vaguely-related posts:

• "'...Charming, Quiet Neighborhood' "
  (January 3, 2014)
• "A 'Bookish' Librarian, Art, Words, and a Rambling Lemming"
  (November 8, 2013)
• "From the Mind of the Lemming"
  (January 6, 2012)
• "Museum of Modern Art: MoMA isn't a Japanese Cartoon Character"
  (December 7, 2011)
• "Lemming Tracks: 'Obey Gravity! It's the Law' "
  (July 9, 2011)