Istanbul-based design studio SUPERSPACE has proposed a new landmark for Croatia’s capital of Zagreb that combines an architecturally striking observation tower with a vertical forest in the heart of the city. Dubbed Ascension, the timber structure would serve as a “new gate” between the historic parts of the city and the post-war areas. If built, the tower would be the 10th tallest building in all of Zagreb and one of the tallest wooden structures in Europe. …The Ascension tower features three main parts: a white and convex outer “shell” that symbolizes the revitalization of the new city; a timber-lined inner “shell” that symbolizes the identity of the old city; and a vertical forest of trees planted on multiple levels of the high-rise to create a visual link to Zagreb’s forested landscape.