Snow on a red hearth (kouro-jou ittan-no yuki)

The original, Hekiganroku, Rule 69. A snowflake fell in a red-hot furnace.

If one has gone through a thorny path of practice, there is no need to get caught up in or dragged down by anything. If the mind is on fire, it expresses the way miscellaneous thoughts and mental wanderings disappear. The trick to prevent the mind from piling up any stray thoughts is to burn them immediately and let them flow away.