It may be said by some that the right slant is the normal slant.
It may also be percieved that whoever writes from left to right naturally uses the right slant.
But as we know some writers do not.
In general interprtation of writing it may be said that the left direction is interpreted as the direction towards the mother as well as the past.
Left slant writing is seen more often in women than in men.
We often see left slant in people who have a disturbed balance in the parantel equilibrium.
Handwriting Analysis Book
The upright slant is found in people who are very independant in life.
They tend to have no inclination to either the mother or father.
Wholly upright hands are very rare.
In fact this may only be achieved by a show of discipline.
The right slant is the most common and and most natural slant.
The right slant is found in people in a hurry, impatient people and the active writer.
Writers with left slant are generally much closer to their mothers.
The ABCs of Handwriting Analysis: The Complete Guide to Techniques and Interpretations
Graphology
Paralumun New Age Village