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**Moiré worms**

This algorithm builds an image up entirely out of short straight lines. The lines are being stacked underneath each other. However, each one is tilted in respect to the one before in a semi-random fashion. The fact that it is semi-random is important here, because if you would do it completely randomly, it would look really messy like shown below on the left (or below on a mobile). I have used a noise generator that is based on Perlin-noise, which makes the behaviour of the stack of lines seem much more organic, resulting in these worm-like patterns.

*Moiré patterns*. This effect is caused by the interference of similar patterns that overlap. Below I have added an example of this effect. They are two slightly different stripe motifs, one is stationary (click on the blue square to reveal) and the other is moving slowly (click on the red square). Clicking on the other coloured squares changes the two motifs to reveal yet different patterns.

Click on the coloured squares on the left to hide one of the two patterns.

Click on the squares on the right to change the properties of the patterns.

**Parallel curves**

* parallel curves*, the distance between the curves is the same everywhere (see below). The lines are segmented into small pieces that take on the colours of the original photograph. Once the lines reach the bottom of the canvas the process is repeated and a new set of lines start from the top. In the works shown here the amount of repetitions of this process count up to about 100.

Left: two parallel lines that are separated by the same distance everywhere (red arrows) and therefore never cross.

Right: two parallel curves that using the same principle never cross.

a) Example of a line and the three parallel lines that are generated. The third line cannot form a smooth line in the bend and the triangular shape is formed.

b) When the line comes across a dark area in the photograph, a sharp bend is made. Here you can see an example of this and how it causes these triangles to form.

c) As the parallel curves encounter the sharp bend, these smear-like lines are formed.

d) This smear-effect makes it look like it is painted.

**Bonus content for scrolling all the way down 😉**

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