The Wedding Tower at the Matildenhoe, Darmstadt 1906-1909. Architect: Josef Maria Olbrich. The tower was erected to commemorate the marriage of the Grand Duke Ernst Ludwig to Princess Eleonore zu Solms-Hohensolms-Lich on 2 February 1905.
On the top floor is the observation platform
On the fifth floor is the room of the Grand Duchess, the “Wedding Chamber”
On the fourth floor is the “Room of the Grand Duke”
The roof motif has always evoked (for me) the image of a raised hand but the sale of matches in the box shown below suggests a different interpretation.