Pencil on paper drawing. This actually took me ages -I did a few versions: 1st one was made up of different bike parts and took days to draw. Threw it out as it was too confusing. Then the 2nd, 3rd, 4th....ones all ended up too busy. This one was born out of frustration _ I KNOW what I'm trying to achieve, its just trying to draw what's in my mind that sometimes eludes me. This is now a tee shirt available at cycologygear.com.