I was living in a one bedroom on East 88th Street in Manhattan, my studio was a tiny closet just off the kitchen - probably about 100 sq ft. - no windows, where my drawing table and a pile of maps just fit. When I finished geology grad school in St Louis and moved to New York City I brought along several hundred decommissioned USGS topographic maps; large sheets of free archival paper. I liked drawing on top of the maps although I didn't know why but most of my work in those days was done on the maps.
I ate my sandwich and started drawing, working until about midnight and then crashed. I was pushing an oilstick around the maps and making a mess. I got up early on Saturday morning and only had coffee, I took out a pencil, sat in a chair and began some detailed doodling.