The human’s brain is hardworking to make only one more idea. I don’t know that the brain function is due to scientific, psychological or chemical. But, I have read the contents in some books.
Can you make so many ideas at once? That’s so difficult. But, you might be able to make ten ideas. Next, you might be able to pump up ten ideas. As a result you can get so many ideas. Of course, that case isn’t the ordinary. The important thing is “ten ideas” make you think you can do that. And you might feel “ten ideas” make you happy.