First Pentad - Water Begins to Freeze: Water surfaces begin to form thin ice, and frost-cold intensifies.
Second Pentad - Earth Begins to Freeze: The land gradually freezes, earth qi stores inward, and plant roots lie dormant.
Third Pentad - Pheasants Enter Great Waters and Become Mirages: Pheasants disappear into wetlands; ancient people believed they transformed into water vapor mirages, symbolizing heavy yin qi.