What is the fine-grained topic of the following text: "As we honed in on the notion of an elliptical form that would fit comfortably with the conflicting geometries of the site and as we began to address the structural needs of the form, we also recalled the traditional symbolic significance of a lantern hung outside a door as a sign of welcome and attracting good fortune," design partner Leo Chow, told Dezeen. Only return the topic.
Designing an elliptical form structure with symbolic significance.