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The Deo Gracias Fresco in the Heiligen Geist Kirche (1326) in Wismar is a fresco that depicts a mathematical-logical puzzle made up of letters. The Latin phrase Deo Gracias (in the Medieval Latin spelling gracias instead of gratias; means "thanks to God") can be read in 504 ways. In a hospital church, the riddle can be understood both as a praise to God and as a remedy. The representation of praise as a puzzle and a learning aid for abstract thinking is unusual and therefore valuable. It is so far unique in Germany.
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