Some of the shadow work is on paper, some on large scale canvases. I captured the original shadows cast by sun and flora onto the paper or canvas. I quickly sketched the outline to capture the forms and shape, then return to my studio. I also use coloured ink as it runs nicely when mixed with water. Additionally thick water solvable pens, or watercolour offers beautiful running formation on the surface when wet. It is important to work flat, so you can control the movement of the paint. Experimental paintings are mad this way.