This pen looks quite ordinary, but is actually quite a feat of engineering – you can use any liquid to write with without it clogging, or eroding the metal. Wine, Beer, Beet Juice, Soy Sauce, Coffee – There is some fun to be had here. It’s on kickstarter for another 67 hours (as I write this) and I’ve just ordered one. This would make my notebook even more fun. Watch the video below: