L'art Pour L'art: Has a modern-day Henry David Thoreau escaped the trappings of the material world and built his own version of a cabin on Walden Pond from the side of the Financial District’s Hotel des Arts? To the disappointmet of transcendentalists everywhere, no. This log cabin hanging high above the streets was not created as a place to withdraw from society or as a call to Union Square shoppers to live more Spartan-like existences. Rather, this is the first installation of Southern Exposure’s Off-Site Initiative. Consumers can breathe a sigh of relief. Manifest Destiny! by artists Jenny Chapman and Mark Reigelman II is on view until October 31, 2012. Hotel des Arts, 447 Bush Street, San Francisco, soex.org/manifestdestiny.