The photo installation Trustrees (2012) consists of 36 portraits of old olive trees that remain uncut and unadorned. For the artist, they are a symbol of the time needed for natural growth, diversity and the longing of each individual for light and nourishment. Traces of weather, drought, humidity, lightning and age are visible in the bark, but they have survived and overcome their crises.
To achieve the specific effect, Frick used old silver gelatin paper that was either too hard or too soft to otherwise be used. Frick was interested in exposing and developing the extreme light and shadow with this material so that light can be light and shadow can be shadow. It is the exact opposite of the grey zone system of Ansel Adams or the indirect light through cloudy skies propagated by the Becher school. This work is also a homage to Kurt Kren and his film Trees in Autumn.