First of all, George, thank you for a short, fun, informative course that really got my creative juices flowing for a few hours. I started off in one direction, and ended up somewhere else entirely.
I started with some sketching, although I am embarrassed that I didn't sketch as much as I meant to. You will see I was working on a few different letterforms when I hit upon the 'S' sketch in the lower right.
I thought that it looked kind of cool and would be easy to test quickly in Illustrator, so I jumped right in. Here is the 's' shape made from the two J-hooks:
This was kind of interesting but I didn't think it would make a very dynamic mark as an 'S'. So what if I took two of them and crossed them:
Ok, my 'X' looks much more interesting, but still not very dynamic. So I started cutting some segments, and closing some others:
This is getting better, and more 'X-ish', but how to add some depth, or movement to the mark:
I really liked the first one, but the other two seemed unbalanced, or the negative space wasn't visually pleasing. What could I do with the first one to give it even more life:
I liked all of these. There is tension, depth, movement, but the one that most said 'X' to me was the first one:
Now to grid it out. You will see that this layout does not use 45 degrees, but rather the 30-60-90 triangle and 180 degree symmetry around the center:
To grid out the X I found it easier to rotate it back 30 degrees to it's orthogonal view:
Then after completing the grid I rotated it back:
And there is my X. I hope you like it. I know I didn't follow George's method exactly, but I feel that I arrived at a pretty satisfactory result.
Looking more closely at my grid I see that there are a few lines and tangents that aren't exactly aligned. When I have more time I plan to tweak the grid to fix these overlaps, and then fully create the shape from my grid, but for now here I am. Thanks for looking. Any comments, helpful criticisms, etc. would be greatly appreciated. Have a great day!