The introduction of the computer has meant that pens have lost their main function. ‘At most we use them to write a few short notes. Otherwise we only use pens to fiddle around with or to chew on. But these actions probably have some positive effect on our brain,’ according to Roy Verbakel. In his three Brainpens he has blown up the pen’s secondary functions. The aluminium ‘majorette’ pen with its rubber coating is excellent for balancing. You can fiddle around with the long, flexible pen with a spring in it which makes it respond to our movements. And because many people click their pens, Verbakel has also designed a messing version that is easy to click but doesn’t make a noise.