2627. Why do these five characters all seem so reflective? 革 宜 畳 丹 舟

They all look the same when reflected in a mirror!  

革  KAKU, kawa - leather, reform

宜  GI, yoro(shii) - all right

畳  JOU, tatami, tata(mu) - straw mat, fold up

丹  TAN - red

舟  SHUU, fune, funa - boat