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Figure 2
Escher Mobile screenshots. (a) Moving an object on the screen gives the opportunity to learn interactively about general and special positions. (b), (c) Changing a motif illustrates the Curie principle.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 39| Part 4| August 2006| Pages 595-597
https://doi.org/10.1107/S0021889806019297
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