Matryoshkas date from 1890, and are said to have been inspired by souvenir dolls from Japan
Matryoshkas are also used metaphorically, as a design Nesting Dolls paradigm, known as the "matryoshka principle" or "nested doll principle". It denotes a recognizable relationship of "similar object-within-similar object" that appears in the layout of multifold other natural and man-made objects. Examples include the Matryoshka brain and the Matroska radio container format.
