Hi Reader: I love pens, and I have collected literal bucketloads of them. My studio is littered with pen containers — boxes, bins, drawers, and coffee mugs all bristling with pens. Despite all this hoarding, I don't necessarily love every individual pen that's in my vast collection, so I conduct a periodic assessment to cull the herd. Normally, my assessment consists of opening the back page of my current sketchbook, scrawling a few experimental lines with each candidate pen, and then...