I was thinking what indicate Summer.
My friend who is a Japanese answered “Morning-Glory and Firework.”
Morning-Glory seeds were imported from China to Japan as a medicine in Nara period ( year 710 -7194) in Japan.
They had Morning-Glory booms twice in Edo period (Year 1603-1868).
People worked so hard for improvement of breed. They made exquisite variety Morning Glory as ornamental plants back then.
Artists painted Morning Glory in their paintings and made wood block prints. Probably you have seen them.
Now they have Morning Glory fairs in summer in Japan.
The most famous one is Iriya Morning Glory Fair.
At the fair, 120 Morning Glory dealers and 100 booths attend and around 400,000 people visit to the fair every year.
Firework is very popular in summer in Japan.
When I was a child, after hot & humid summer day neighbors got together to do a small firework party in the evening. It was so fun.
Of cause there are many big firework fairs.
They are so beautiful. Some of them are fantastic performance with firework with music.
This painting came from beautiful cheerful memories.
I hope that you like it.