Energized, I felt confident enough to return to box designs for the CEL logo. I was creating orthographic art - trapezoids and diamonds - that when assembled looked three-dimensional. It's a powerful op-art effect. I had to use a little mathematical geometry to make certain the pieces all fit properly, something that is a lot of fun for me. At one point, I considered making an orthographic tesseract: a four-dimensional representation of a cube. I'd still like to do that project, but I thought my time would be better spent focussing on what the client wanted.
These designs tested well. They aren't as precise I would have liked, though.