Here are some useful online resources:

Albert Bregman’s Auditory Research Laboratory provides an extensive library of Auditory Scene Analysis sound examples together with their analysis and accompanying theory:

Diana Deutsch website consist a rich resource on auditory illusions with loads of sound examples and broad analysis:

Michael Bach from Klinik für Augenheilkunde made this comprehensive list of visual illuisons:

A research database. Good resource for more technical and detailed explanation of some of illusions and paradoxes:

Search the internet for Op art.

Max/msp tutorial on Shepard tone/Risset glissando:

Processing resource with a lot of relevant visual and code examples:






Recent Posts

Pattern creation

For my patterns, I was inspired by the Islamic Architecture. The simple geometry of the motif combined with the complexity of the final pattern was the reason I choose to search and experiment with these patterns. I was also interested to generate such patterns automatically, in order to have a variety in short time.

As a result, I create an application in Processing [1][2], which generates Islamic rosettes and stars. I used a set of parametric equations taken by Bastanfard & Mansourifar’s article, “A Novel Decorative Islamic Star Pattern Generation”[3]. Due to the different software, some modification was necessary to be made. The final application can generate different rosettes and stars every time I run it. The variety is achieved due to three parameters, which take random values in a certain range. Every new motif is saved as a png file for further editing. The initial idea was to generate patterns in this application, after the creation of the primitive motif, but the size of the required file was so big that made the process very slow. Furthermore, with other techniques and software I had the freedom to create more complex and interesting patterns.Another parameter that is important for the Moiré Effect, is the size of the stroke.


The three parameters and the size of the stroke that affect the generated motif


The same application creates either rosettes or stars by changing the commented lines


The parametric equations that define the points


Using the motifs from the above application, I create more complex motif in Photoshop and I experimented a lot with different compositions, mostly by changing the scale and the position. This video shows the process that I followed.

For the patterns, I tried a lot of technics in order to find the most appropriate and quick. In this video I show the best I found.


[1]         “Language Reference (API) \ Processing 2+.” [Online]. Available: [Accessed: 20-Jan-2015].

[2]         “The Nature of Code.” [Online]. Available: [Accessed: 20-Jan-2015].

[3]         a. Bastanfard and H. Mansourifar, “A Novel Decorative Islamic Star Pattern Generation Algorithm,” Comput. Sci. Its Appl. (ICCSA), 2010 Int. Conf., pp. 111–117, 2010.

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