One of my clients taught a well received Scientific Python Curriculum for Scientists & Engineers. I came in and added images early on to help make a landing pad for those who could crash due to the complexity of some of the material. The images were added to calm the viewer and at the same time add an additional layer of explanation.

The materials were given a redesign and I designed the overall look and feel of the user experience. What you see below in some of the materials from the courses I worked on.