Stomata are minute aperture structures on plants found typically on the outer leaf skin layer. Already in high school Petra de Vree fantasized of what skin-mouthes (the Dutch term for Stomata) could look like.  The green color of her Stomata refers to the color of the leaves of a plant.

The sizes are 30 x 11 x 5 cm and 30 x 8 x 5 cm.