Irregular composite poster in two parts. A celestial motif is prevalent in both of them.
In late 1973 Thek was invited to work in situ by the director of Lehmbruck Museum, Siegfried Salzmann who gave him carte blanche. Thek practically camps in the museum, in the middle of the collection while constructing his environment, lining the walls and ceilings of the exhibition room with newspapers, building room dividers and corridors, devising in essence, a new version of Schwitter’s Merzbau.
“Ark, Pyramid – Christmas (Die Krippe)” was a further development of his previous rooms / environments in Amsterdam, Stockholm, Kassel and Lucerne. Furthermore, the festive period provided Thek with the occasion to present, for the first time, a self-written theatre piece in the form of a nativity play featuring children from Duisburg. (The oblong part of the poster being a direct hint to the Star of Bethlehem.) 

As with the majority of Thek’s works, the whole environment has not been preserved with only few individual bits and pieces surviving, after being purchased by the museum at the time. Documents like this play an important role in revisiting and ‘restaging’ the artist’s visionary oeuvre and are of great exhibition and research value.