a two dimensional surface and creating my three dimensionality through color and perspective alone. but mostly the treaty pen i make a drawing and lift it off the surface and hang it in the room space so i ve got the entire room to work with what is the war my number of arms of. the pen works much like a hot glue got a plastic filament is heated until it extremists from the pens to the molten plastic had its interests read within seconds. or miss is the first i had some problems adjusting for the speed of the pen. the plastic strand comes out of the tip at a constant speed and i have to work with that must have some control over how thick . strands and dust go through the speed workouts item but i can t just dust something off i have to go with the flow. mark bill and does still work with