What is the fine-grained topic of the following text: Cigoli was involved in the overall design and execution of the project, and in particular with the design of three triumphal arches at points along the route of the procession: at the Porta al Prato, the Canto dei Nelli and the Canto alla Paglia. Only return the topic.
Cigoli's involvement in the design of triumphal arches for a procession project