Most often because I see other people (on the internet for example) who have done something really cool, and then I try to make something similar that can be used for my project. So I get inspired by other people, I guess.
Sometimes they just pop into your mind. Other times you see something completely unrelated, but it triggers an idea.
If you are not too creative, brainstorming is another way to generate ideas. This is good if what you want covers different types of engineering types.
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