I lived with Lou Hartman at San Francisco Zen Center's City Center from August of 2006 to December of 2009. When I first moved in, Lou would come to the basement zendo most every day for zazen, and take his seat. He always sat in the northeast corner. Later on, I found out that he sat there because that is one of the few seats where you sit facing an actual wall. In most of the City Center zendo seats, you sit facing these opaque white windows.