The different emotions for falling leaves between Spring and Autumn

Leaves are so brilliant here in Japan now.
We feel/think the scenes like these are suitable for these of Autumn.






When they start being falling and have raked on the ground,we feel Winter has come.
Such a emotion is similar with the emotion when we see cherry blossoms in Spring.
When we see cherry blossoms,almost people feel happy and Spring has really come.
In addition we also felt beauty and sad when both Autumn leaves and cherry blossoms are falling.

It`s easy for you to understand as for in Autumn because Winter is often imaged as dark and lonely.




But after cherry blossoms are completely fallen,situation is different.
weather is more and more moderate cool and comfortable covered with young green trees. It may be natural to be more cheerful.
Nevertheless we feel sad.
That`s why,the emotion for falling cherry blossoms might be different from that for falling Autumn leaves though both are almost alike.

I have no idea why we have such a emotion for them.
Who can explain it objectivity?