Design products are becoming increasingly dynamic, which makes it difficult to sustain a design process based on static prototypes. Design is how it works and sketching in code is the only natural way to prototype a dynamic system. Building even the simplest of data visualizations means hours of work in languages like R, Julia or Python. When your content is data, poking around in Photoshop simply makes no sense. In some way, it's the direct opposite of design: prettifying without context. One important aspect of modern design products is their increasing demand for temporal logic, where a linear narrative is replaced by a set of complex states. Many apps and games need to dynamically transition between hundreds of states, and static design tools fail completely in prototyping these kinds of products. Another example is the use of procedural elements in games, where it's simply impossible to design everything by hand. Visual thinking is increasingly done in code, and there isn't much to do if you can't program. As our design products become dynamic it makes less and less sense to separate the design and implementation. Rune Madsen.