The aim of the book is to study symmetries andtesselation, which have long interested artists and mathematicians. Famous examples are the works created by the Arabs in the Alhambra and the paintings of the Dutch painter Maurits Escher. Mathematicians did not take up the subject intensively until the 19th century. In the process, the visualisation of mathematical relationships leads to very appealing images. Three approaches are described in this book.

In Part I, it is shown that there are 17 principally different possibilities oftesselationof the plane, the so-called 'plane crystal groups'. Complementary to this, ideas of Harald Heesch are described, who showed how these theoretical results can be put into practice: He gave a catalogue of 28 procedures that one can use creatively oneselffollowing in the footsteps of Escher, so to speakto create artistically sophisticatedtesselation.

In the corresponding investigations forthe complex plane in Part II, movements are replaced by bijective holomorphic mappings. This leads into the theory of groups of Mobius transformations: Kleinian groups, Schottky groups, etc. There are also interesting connections to hyperbolic geometry.

Finally, in Part III, a third aspect of the subject is treated, the Penrosetesselation. This concerns results from the seventies, when easily describable and provably non-periodic parquetisations of the plane were given for the first time.

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