  The portrait of Mona Lisa is scrutinized with reference to quantum mechanics.
The elements of different expressions are firstly recognized on her face. The
contradictory details are then classified in two pictures that, undoubtedly
representing distinct moods, confirm dichotomous character of the original.
Consecutive discussion has lead to conclusion that the mysterious state Mona
Lisa is in actually is coherent mixture - superposition, of cheerfulness and
sadness.
