I am completely in awe of the creative thought-process of Kumi Yamashita!
Objects are placed in precise locations in relation to a source of light.
A portrait materializes from the resulting shadow.
Think positive and negative space.
As the artist says, "The complete artwork is therefore comprised of both
the material (the solid objects) and the immaterial (the light or shadow)."
See more at the Kumi Yamashita website.