320 x 352 pixels, created using a Vic-20 computer.

The moire patterns shown on this page were all created using a system of up to 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting. The lines of the scans could be drawn inside outer-shapes of circles, squares, or squares at a rotated angle. The lengths of lines used for the scans of radiating lines could be changed before the scans were drawn (setting the dimensions of the outer shapes). The two scans could be offset both horizontally or vertically (more typical).

With this image, the recorded specifications were:

Single scan only.

Scan shape: square, rotated at 29 degrees.

Minimum length of lines in the scan: 596 pixels.

Number of lines in the scan: 2,050

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting.

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting. The 2 scans were drawn with a vertical offset of 25 pixels each.

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern uses 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting. The 2 scans were drawn with a vertical offset of 19 pixels each. There are some excellent contra-curved lines shown in the patterns in the outer regions.

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting. The 2 scans were drawn with a vertical offset of 7 pixels each. The curved ‘white lines’ coming out from the central shape remind me of ‘lines of influence’ surrounding magnets.

320 x 352 pixels, created using a Vic-20 computer.

This fabulous moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting.

It is amazing how the system of drawing sets of ‘exclusive-or’ lines over the top of each other with slight changes in the way they are drawn results in a myriad of subtle patterns and changes in tonal density. I am reminded of the intricate detail that can be found within Mandelbrot images.

All of these Moire Pattern images actually took a long time to render on the Vic-20 - typically several hours each. The Vic-20 computer was a reliable computer, but it took a while to work through so many machine-code drawn lines, set up though through a BASIC program.

Changes in a small set of parameters led to quite different results. There was a need for a lot of trial and error (and patience), to find special results.

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting. This result shows softly changing regions.

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting. This result shows a good mixture of sharper and softer regions.

320 x 352 pixels, created using a Vic-20 computer.

This spectacular moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting.

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern was created using a single scan of radiating lines, drawn using the special ‘exclusive-or’ plotting.

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting.

320 x 352 pixels, created using a Vic-20 computer.

This moire pattern was created using 2 layers of scans of radiating lines, drawn using the special ‘exclusive-or’ plotting. It is interesting how this image has been divided into quite asymmetrical ‘radiating regions’.