These are little things that accumulate in my sketchbook. There are days when I know what I want to draw and days when I just open a book and... if I don't start right away - I might never start - so I take first thing in front of me and start moving my pen - be that a tree trunk or a broken light switch. Or - if I managed to clean my table so much there is nothing there - I open up the news (that's the one about the death of Koko the gorilla) and draw - the trick is not to read too much - just glance, close and draw from memory. I drew that branch with tulip tree from memory too I believe - it was still on my table but by accident, I left a book on top of it so it became flat - hence this is my memory of how the now flat branch looked like the day before :)