There are so many different forms, and sub-forms, of printing
There are so many different forms, and sub-forms, of printing because over the centuries a wide variety of artists have enjoyed exploring and pushing the "limits" of printing technology further and further. Artists from Rembrandt through Picasso to many more today and beyond have enjoyed exploring these "limits" trying to find the technique that best suited their own purpose and vision. In Rembrandts time one of the main reasons for prints (etchings and woodblocks mostly) was to make images of paintings available in largish quantities to the general public at a reasonable cost and it is still true today that we can enjoy many of the greatest artist's work at affordable prices.
Drawing is perhaps the oldest, the first artistic medium for human beings self-expression and communication predating the written word with images drawn on our cave walls. Just like our handwriting, every person`s drawing line reveals (betrays?) their personality as surely as it reveals their talent.
Why shouldn't art be pretty? There are enough unpleasant things in the world. - Pierre-August Renoir
Abstract art is the dried fruit of a correct argument - Max Ernst.