Made with HTML/CSS (no images, no JS) this is a simple interactive experiment with responsive design techniques. Using simple layout wireframes, this illustrates how a series of pages could work across these different devices, by simulating how the layout of each page would change responsively, to suit the context.
I hear a lot of people talking about the importance of sketching when designing or problem-solving, yet it seems that very few people actually sketch. As a UX professional, I sketch every day. I often take over entire walls in our office and cover them with sketches, mapping out everything from context scenarios to wireframes to presentations.