This is a follow-up to my earlier post on pen storage. I want to know: is it best to store pens horizontally or vertically? And does the answer vary depending on the type of pen that is being considered (fountain pen, ballpoint, gel pen, etc.)? And, if pens are stored vertically, should they be stored tip up or tip down?
My mom, who primarily uses ballpoints, swears by storing her pens vertically, point downwards, in a pen cup. This practice has, on occasion, led to globs of ballpoint pen ink being deposited in the bottom of the cup. In contrast, I've always stored my pens horizontally, thinking it was the safest option, although an acquaintance once suggested that was the reason why some of my gel pens developed air bubbles in their ink cartridges.
So now I turn to you, readers: what is the best solution? Are pens best stored horizontally or vertically? Or does it even matter at all for some types of pens?