yuppie! here it is..
square pencils would be easy to manufacture but not very comfortable to hold; round pencils are comfortable to hold but more costly to manufacture. hexagonal pencils area compromise. they are ab as comfortable as round pencils yet less costly to make. nine hexagonal pencils can be produced from the same amount of wwood it would take to make eight round ones, and the hexagonal pencils require one less processing step. hence the prevalence of hexagonal pencils.
in fact, sales now indicate that the hexagonal shape is preferred eleven to one over the round, perhaps because the hexagonal pencil is less likely to roll off a desk or drawing table. :cool:
now, ever wonder why so many pencils are yellow? :D