Poster for cipher game (puzzlehunt) iNula I have been co-organising since 2010. The poster has two variants, day and night, and differs year from year slightly but mostly just the text changes, this one is from 2012. I tried to keep continuity with some older designs of the poster.

Poster for children cipher game (puzzlehunt) Přerovský ledovec I co-organised in 2010 for TK Cassiopeia Brno.

Poster for children cipher game (puzzlehunt) Boskovická sluj I co-organised in 2013 for TK Cassiopeia Brno.

Poster for cipher game (puzzlehunt) Kód: Zeppelin I co-organised in 2014 for Jiří Mahen library.

Winner diploma for cipher game (puzzlehunt) Per partes I co-organised in 2011. It was cut to four pieces along the colour boundaries and each team member got one piece.


Essentially each cipher in a cipher game (puzzlehunt) can be considered a graphical work on its own. I have already devised, designed and realised around a hundred of such ciphers and puzzles both for public games iNula and Per partes, and also for some private ones. Many ciphers have the form of plain text, others are represented by physical objects or even the environment. Some are graphical in one sense or another; a handful of selected creations of this kind is presented here.

Cipher 10 from iNula 4 (2010, medium).

Cipher 6 from Přerovský ledovec (2010, easy).

Cipher Kolečka from Per partes 2011 (medium).

Cipher Obrázky from Per partes 2011 (easy).

Cipher 4 from iNula 5 (2011, medium).

Cipher 7 from iNula 5 (2011, medium).

Cipher 13 from iNula 5 (2011, hard).

Cipher Vánoce used at a special private event (2011, hard).

Cipher 6 from iNula 6 (2012, medium).

Cipher 8 from iNula 6 (2012, easy).

Start cipher from iNula 7 (2013, easy).

Cipher 13 from iNula 7 (2013, hard).

Cipher Korálky from Per partes 2014 (easy).

Cipher Police from Kód: Zeppelin 2014 (easy).

Scientific illustrations

I draw relatively a lot scientific illustrations for my papers, posters and talks (and occassionaly for papers, posters and talks of my colleagues). Some are simple, some are more elaborate. Some of them or their parts were, in fact, calculated instead of drawn because humans are poor at depicting things such as randomness or roughness correctly.

Schemas of a plasma jets in INP Greifswald and RUR Bochum.

Schemas of some plasma polymerisation reactors.

Electrospinning schema (based on an old sketch).

Illustration of defects of thin films.

Data, mask and presentation visualisation in Gwyddion user guide.

Multilevel fitting schema of imaging spectrophotometry data.

Band schema of diamond-like carbon (an improved version of Daniel Franta's sketch).

Parametrisation of reflections and refractions in a multi-layer thin film system.

Visualisation of concepts used in one-dimensional profile roughness characterisation.

Illustration of peak and valley roughness characteristics.

Overview of typical spectral ranges relevant for the contributions of various processes to the dielectric response of materials.


Gwyddion is not only a great microscopy data analysis software. It has also been acquiring a number of artificial random surface/image/pattern/texture generation algorithms thanks to my interest in them. Some examples follow. Generally, they are based on real physical models, but often heavily simplified.

The square hole pattern generator was abused to produce a sort of effeminate pinky retro texture.

Every zombie must love non-equilibrium Ising models as they can provide an infinite supply of brains.

Close to an actual physical simulation, the growth of a columnar film.

Diamonds are forever. As are Voronoi tessellations.

It is Caribbean disco time!

Thanks to the ‘naturally shaped’ cells, Voronoi tessellations never fail to give interesting result. This time the cells were kind of rectangular, but with a twist.

Fractal flakes grown by diffusion limited aggregation, with local contrast filter applied.

Frost-like pattern, also generated using the simulation of columnar film growth.

An impressionistic maze? Well, actually it is the non-equilibrium Ising model again, this time tweaked to obtain squarish waves.

Need some metallic bark? Just use wave superposition.

Fractal moss grown by diffusion limited aggregation with Schwoebel barrier.

With larger spatial frequences, wave superposition can also result in nice wave threads texture.


Micronetwork was a project solved at Department of Physical Electronics for which I created some promotional materials in years 2010 to 2012. The designs had to incorporate in one way or another the existing logo of the project and various mandatory graphical elements.

Memory game (called pexeso in Czech) on the topic of plasma technologies (2011).

Warning: The linked PDF is huge (close to 100 MB).

Memory game (called pexeso in Czech) on the topic of nano-world (2012).

Warning: The linked PDF is huge (close to 100 MB).

Promotional t-shirt (2012). There is also an accompanying tea mug.


Cover of PhD thesis of my friend Jiří Polcar (2004), see also detail of the image.

Splash screen of SPM data analysis program Gwyddion I am a developer of (2006). I also drawn almost all the icons – out of necessity since we had no one else to do it. Some are rather poor, but anyway I have learned a few things about icons thanks to this work.