The House of Marble

Once upon a time there was a marble sculptor known for her contortionist sculptures done with extreme anatomical precision.

Many people kept guessing how she can be so good and they had all the weird and horrible ideas...

The truth was simple: she was a contortionist and a witch. She would do all the flexible poses by herself using psychokinesis, a form of mental movement of solid matter, in this case her own body. After her body was twisted enough, she would make a shadow mirror of herself and use a petrification spell on the cloned image to turn it into marble. Quite trivial if you think of it! :D