2103. This #kanjipuzzle is about evolution. Start with one character, add a few strokes, and get another, then repeat. 一 -> ? -> ? -> ? -> ? -> ? -> 燈

一 -> 二 -> コ -> 口 -> 豆 -> 登 -> 燈  

一  ICHI, ITSU, hito(tsu) - one

二  NI, futa(tsu), futa - two

コ  Katakana "Ko"

口  KOU, kuchi - mouth

豆  TOU, ZU, mame - bean, pea

登  TOU,TO, nobo(ru) - climb, board

燈  TOU, akari, tobo(shi) - light, lantern