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At this degree of magnification it is possible to see how the grain of the paper, a smooth cartridge, interacts with the ink from the drafting pen.
It is probable that the two pens used here were 0.2mm and 0.5mm Rapidographs, but I’m not absolutely sure after the passing of over thirty years.
This first exercise did not have any construction lines associated with it, as can be seen here.
It was carried out to explore the relationship between stars based on ten-point geometry and there must have been construction lines before this was drawn, perhaps just pencilled in as these were all drawn manually rather than with a computer.
The setting out is easily established, being based on four point geometry, the diagonal lines are all base on joining intersections with themselves and with the horizontal and vertical centering lines.
It’s a clever construction but one that would have been easy to set out.
Sometimes this happens, as can be seen on the 120° angle on the left but, on the other two angles this has not been accomplished.
Note that it is not as symmetrical as I would have liked.
This type of design is not uncommon, a variety of continuous lines being easily drawn and being suited to a design that interweaves. There are a number of patterns used to produce interlocking tiles, and this is just one of them.
Again the basis of the design is four-point geometry set out from the centering horizontal and vertical lines and then just repeated as far as is required.
It is placed here to show something of the concentration that goes into study of this character of geometry as well as the accuracy I tried to maintain in drafting.
Nowadays, drawing with computer programmes, there are still inaccuracies, but they are easier to deal with than when drawing with ink on paper.