The main element is the translucent curtain with crystalline structures and circle-shaped cut outs which descends upon the works like a scenery. Again and again it allows insights at the drawings and paintings and in this context plays with the perception of close and distant similar to a lens. Besides geometrical forms celestial bodies come up as if the viewer could explore a new cosmos through a telescope.
In his works Bartel is interested in scientific imagery and its potential to render spheres visible, which to the bare human eye are imperceptible. Having before concentrated on the microcosm (microscopic images), he currently focuses on the macrocosm (telescopic images): While we attempt to explain certain phenomena in the universe with the help of tools like photography and simplified geometric, graphic forms, many of these occurrences still remain fundamentally abstract to us. Nevertheless man seems to be a "homo investigans" (engl. exploring human) who searches for explanations his whole life regardless of how complex or obscure the topic is. Often it is not crucial for him if his attempts of an interpretation are rationally comprehensible but rather if they help him to oppose the abstraction of things. But finally they again result in an abstract construction in spite of all the technical achievements and possible forms of expression.