Not sure the reason, but I used to associate Pink with being vibrant.
Here are several photos with pink as the principal color.
One is a sort of kale with vibrant pink colors with I saw at the Kadoorie Farm, Hong Kong.
The other pink flower is a common flower in Hong Kong.
The one with bubbles was taken off a painting in Beijing.
So much so for “Vibrant”, I am ready to move onto a new theme.