It didn't intentionally start out to be an ugly pen, but this experiment didn't work so well. I think it could be better if the segments were in different proportions (both black segments should be shorter), but even then...
Barry,
I think that the one on the bottom of the pen is OK. What throws it off to my eye is the one on the cap. If the black wood was larger diameter than the brown wood (like on the other end) then it would be ok.
Your idea of smaller segments may help too.
Keep trying
It looks like a prototype of what will eventually be a beautiful pen. I've got a box of "experiments" in the shop that I will revisit at some point. Most don't look any where near as good as your pen.
I haven't completely given up on the *concept*, but I knew well before I put this one together that it would end up disassembled. Oh, well -- I get the pleasure of turning two (or more ) pens for the cost of one kit.