From the introduction:
You are walking through a field. You look down and see your shadow, cast from the sun shining down on your body, darkness upon the grains of wheat, matching the outline of your body.
You know your shadow well and you always have. Your shadow walks with you, a dark reflection, a fellow self.
Shadows and Treasures forms a type of meta-game that is played between other game sessions. It allows the collection of significant memories (results) of other games.