The game's plot is connected to the story of Homunculus, an artificial human whom the alchemists of the Middle Ages tried to create. The dream of creating artificial life forms was very popular in medieval Europe.
There is a sub-quest in the game which involves you bringing a kitten from the present time to a girl who lives in the beginning of the 20th century. If you bring her the kitten, and then return to the same house in the present, the whole place will be full of cats ;)
Lebensbaum, the name of the town where the events of "Shadow of Destiny" take place, means "Tree of Life" in German.