Clouds are a good reminder for structural engineers that the world and its structural bodies are not always rigid. We tend to focus our attention on an ever increasing rigidity to resist the lateral and vertical forces of nature. While opportunities to design structures which behave otherwise are few and far between, it’s important for the mental activity of those who wish to remain creative to think of structures as not only rigid, but supple, intentionally ductile. A few examples of pertinent applications are inflatable structures, tensile membranes (a la Frei Otto), or floating vessels. A great teaching narrative for this issue surrounds the early development of floating offshore oil platforms. Before the development of floating platforms, the rationality of offshore drilling was to make derricks more and more rigid as depths became deeper and conditions more severe. A major breakthrough came when structural engineers realized that increasing rigidity was no longer practical and that a platform that would flex with ocean current was necessary in order to explore new territory. This manner of thinking, not just in terms of rigidity but in terms of outcomes and economy, are crucial to engineering. They are not always obvious, not necessarily taught. This is precisely why engineering is a complex and creative act.