The middle of spring was vernal equinox,
Daytime was getting longer and night was getting shorter.
＜Spring Equinox＞ and ＜Vernal Equinox＞were even day and night.

A boy of "vernal equinox" stood on cloud to differentiate between yin and yang.
It was a symbol of even day and night.

A boy danced with a official mask as god to gave bliss to people.
Best wishes to all with peace, wealth and lucky.