The beauty of the calligraphy is in the merger of the message with the fonts used. The font style enhances or enforces the message of the text. This makes the artwork even more meaningful.
The first truly calligraphic works used brushes. These were not paintings or drawings per se, but more of a reverence to the message written on paper. In the use of the written word and characters instead of drawings, the distinctions have been made, and these distinctions have endured through the millienia.
Later, of course, the ease of use of pens, have led to less calligraphic works made with the brush and as there developed more reliance on the use of a pen. The first pens used for calligraphy were made of quills. With increasing literacy, the pen became more popular, and this lead to commercial production of pens, with nibs, and later on with pens which carried their own inks. Fountain pens were a natural progression in the development of pens.
Today’s calligraphic pens have nibs which can be replaced according to the artists style or design.