The brain has 2 hemispheres,the left and the right.The left hemisphere is generally for creative endeavours,the right for analytical type problem solving {depends on handedness}.When you have been sketching for quite some time and you look at your watch and it way past the hour you thought it was thats because you shifted from one hemipshere to the other,or the creative side from the analytical.The creative side has no real ability to judge time passed,so thats why so much time goes bye bye when you are drawing,however if you were drawing and make say a line and you name it the line in your head as you are doing it the other hemipshere will appear with a rush again and unless you can shift easily between one to the other as the majority of artists can do you will find the image becomes a bit mechanical because the analytical side is now drawing your image.Its like adults who are asked to draw a human being and they draw something like a stick figure and get really annoyed,well this because as children we used to draw stick figures and this logged in the brain,but many years later the moment you are asked to draw a figure this log pops up,its kind of like this,I want to draw a figure,the creative side trys to start the process and the analytical jumps n front and screams I know how to do it and quickly produces the old stick figure log again,however if you learn to cognitvely shift anyone can become at the minimum a reasonable artist,its about a shift from one hemisphere to the other.A very good book on this subject is Betty Edwards Drawing on The Right Side of The brain,it explains the process better then I can.Between the hemipsheres is a tangle of like wires called the Corpus Callosum and it joins the left and right side of the brain together,without the connection people can not recognise one of their hands as being their own etc 
Ok rant over.
Oh ya I am left handed and calligraphy is a real bitch.
Someone should nvent a numeric pad with some command keys that clips to the side of your puter at a 80 degree angle say.
Stu.



