The Tree Top project introduces a new form of plant ornamentalism to the city, utilizing forest species prized as timber, pulp, mulch, and fuel as ephemeral contributors to the urban environment. Species such as Abies alba, Fagus sylvatica, Picea abies, Pinus sylvestris, Fraxinus excelsior, and Pinus cembra contribute materials and energy to Swiss culture through an array of forest products.Our project assigns new aesthetic value to fallen trees through the introduction of their tops, or crowns, as ephemeral and transitory participants in the urban milieu and partial contributors to the urban canopy.Industrialized forestry has a long history of manufacturing disembodied tree parts for economic consumption. Timbers make our buildings. Pulp makes our paper. Pellets heat our homes. This disembodiment is un-ceremonial and in many ways dematerializes the relationship between the forest and the city. The Tree Top project materializes these reciprocities by creating a new forest product for the city to consume; an ephemeral and interactive tree canopy.The ceremonial introduction of a temporary urban tree canopy juxtaposes the processes of forestry with the ambitions of ‘green’ city, establishing a new hybrid that verges on the domestic, industrial, and profane. This process is animated through the creation of urban vases to display tree crowns adjacent to the Cathedral of Notre Dame in Lausanne.The vases engage participants with soft surfaces for repose and interaction, with each human action reorienting the position of the canopy by altering the balance of the vase, and composition of grove. Vases have a long history of use in domestic and ceremonial space, yet are conspicuously absent at the urban scale. Our project conflates the ceremonial and domestic with the industrial and ecological, creating spectacle for speculation, building upon the early experiments of Stephen Hale’s “Vegetable Staticks” of 1727 in the context of contemporary garden.