These two hanging screens are made of strips of birch tree bark.

The screen changes when it is lit from behind

The two overlapping edges of the screens.

"Interstice", as lit from behind (detail). The series of gaps and small openings in teh screens serve as tiny pin hole cameras, which transform the lght as it passes through them.  

Light spots cast by pin hole cameras by one screen onto the other.

"Interstice" (detail)

Detail of pin hole camera.

Light pattern cast by the pin hole cameras on the wall behind.