sprout by Igor Lobanov from russia

the main feature of the developed pen - the structure of a core for ink. it reminds a plant stalk, a sprout under the form. colour of a cover of a core adds with colour of ink gives green natural colour. by the writing, as ink is spent, the stalk develops, like a withering plant, and its colour becomes more yellow. complete with the pen there is a special support. when the pen is in it, it is slowly filled with ink. this pen is a reminder on necessity of a rational expenditure of natural resources. words cost much.