The fountain pen originated from the quill tube.
The quill tube pen is soft and elastic, with significant variations in stroke thickness and varied pen tips.
The thickness of the lines drawn by modern needle pens is uniform, and the composition of the lines relies entirely on the density and virtuality of the lines.
It is particularly suitable for using tools to draw (linear rulers, curved rulers), which is also the main characteristic of modern architectural painting.
In modern times, there are still plastic pens, felt pens, etc.
The pen tip is thicker, and the pen tip is rotated to control the amount of water and the weight of the stroke.
The brush strokes can vary in thickness, and there are no restrictions on the size of the strokes.
Felt pens are thicker and generally suitable for freehand drawing techniques such as sketches.
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