The experimentation process is an interesting one. I've been looking at all these fantastic typefaces that people make, but where do they start?
Here's a bit of my process:
1. Research a specific area of type and find examples
2. Ask a load of questions related to how it might be made
3. Pick one
4. Ask deeper questions about that one question
5. Start playing
My question is:
1. How do additive and subtractive processes affect the shape of letterforms?
And deeper:
1. In what ways can I add?
2. In what ways can I subtract?
Here's a test. I took Karmina and for each letter subtracted the uppercase from its lowercase version:



In this one I overlaid the same letter, rotated it through 90 degrees and subtracted it from the letter behind. There are some nice formations in there.

I love that 's', it's got some nice geometric form to it, it smacks of the British flag...

I like some of the shapes that come out of this one. The letter is duplicated, rotated through 90 degrees and added. The o and the x are kinda cool, they retain their shape. Everything else looks like ancient symbols!