It was difficult to fathom Sheldon. He did come across as a hard line Leftist or Marxist. This was confusing for me and for the others. Was he phony or was he genuine. I could honestly not tell at the time. Anyway, whatever misgiving we may have had regarding his Leftist credentials, we were awe struck and quickly fell under his spell as he gave us an impromptu lecture on environmental activism. He spoke about 'guerrilla gardening' which involved planting seeds of indigenous trees in any open space within towns, cities and suburbs.