Future advances in penmanship

Look at how Mavic Chen holds his futuristic writing implement in The Daleks' Masterplan:

In the DVD commentary, Kevin Stoney is asked who came up with the idea of holding a (for lack of a better word) pen this way. He can't remember, which is sensible as forty years have passed.

Still, I love that somebody, whomever it was, decided that they needed to come up with a clever new way to hold a pen, just to show that it is the future.