2167. This #kanjipuzzle is about evolution. Start with one character, add a few strokes, and get another, then repeat. 一 -> ? -> ? -> ? -> 味

一 -> 十 -> 木 -> 未 -> 味  

一  ICHI, ITSU, hito(tsu) - one

十  JUU, tou, to - ten

木  MOKU, BOKU, ki - tree

未  MI - not yet

味  MI, aji , aji(wau) - taste