1631. Why do these five characters all seem so reflective? 覚 完 示 宗 査

Answer:

They all look the same when reflected in a mirror!

覚  KAKU, obo(eru), sa(meru) - remember, bear in mind, wake up

完  KAN - completion

示  JI, SHI, shi(mesu) - show

宗  SHUU, SOU - religion, sect

査  SA - investigate