How Copyright Works (Part 2): The 'Idea-Expression Dichotomy' || What Is Law Even

Part 2 of a five-part series explaining copyright law in super-simple terms! In this part, we'll explain when you become a copyright owner, and what the super-technical "idea-expression dichotomy" really means.

Check out the rest of the videos in this series here:
#2 - When Copyright Arises: [you are here!]

Do also check out the series of videos on my main channel discussing the aspects of copyright law that music cover artists need to know:

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[filmtherapybw]

I have a question. I read a manga story, and I loved it. But I took the concept/idea and made my own manga with it, using my original characters, locations, etc. Will I get in trouble for copyright?

[minutegaming]

How far does something need to go for it to be a "creative thing"?
For example, melodies, chord progressions, etc. are created+expressed, but can be very vague, especially with small phrases that could possibly have come about independently.

[BumberenzoTheFireEngine]

I have a copyright question too. I have a fire engine and other vehicle characters, that can turn into small tool boxes on wheels in order to go to small areas.

However I assume that there are many other people who came up with the same ideas of vehicles shrinking and going into smaller areas.

However my idea is very different. The way I express my idea is that the vehicle will turn into a toolbox on wheels so it can go somewhere else that where humans can.

If this is what I came up and so did others, is that an idea or an expression?