Inverted Fireworks #MinHaiTimeCapsule [Today's Tanka]

In the indigo sky, fireworks are launched, their firework-colored light diving beneath the lake and spreading out.

Hello. This is Hanemiya.
I am participating in Shirokumakirin-san's project.

The idea is to create haiku, tanka, senryu, or dodoitsu using the colors of summer as you imagine them.
The rule is that you must include a color in your work.
You can include as many colors as you like, or even colors of your own invention.
It seems like a wide variety of colors will be gathered.

What I imagined for summer was 'fireworks'.
Fireworks come in many colors.
I briefly thought about including many colors, but since fireworks look best against a dark sky, I decided to include the color of the sky.
And for the rest, I used my own invented color, 'firework-color'.

The reason I didn't just use the word 'fireworks' is that, personally, my image of fireworks is one of flames and smoke.
The smell of smoke drifting after the fireworks was in my mind.
I'm an indoor person, but when I was a child, I was taken to fireworks festivals.

Also, I felt that things launched into the sky look like they are diving downward when reflected on the surface of a lake.
Up and down, fire and water, rising and diving—I wanted to reverse them.
Perhaps that would have been sky and sea...
But I have never actually seen fireworks launched over the sea, so I'll leave it at that.

There might have been better word choices.
This is how I can compose it as I am now.
I might think of another version later.
Thank you for reading.
This was Hanemiya.