1213. Why do these five characters all seem so reflective? 介 界 春 禁 果

Answer:

They all look the same when reflected in a mirror!

介  KAI - shellfish, be in between

界  KAI - world

春  SHUN, haru - spring

禁  KIN - prohibition

果  KA, ha(tasu) - fruit, result, come to an end