Crayons are a child's passport to creativity.
Meaning: This means that crayons help children to be creative.
Choice of Words: Passport is an official document issued by a government that allows the bearer to travel to and from other countries. Creativity is the ability to produce original and unusual ideas or things. When you put them together, "Crayons are a child's passport to creativity" means that crayons give children the freedom to explore their creativity and express themselves.
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