Comparing something hard to something easy. Please help!

I am doing a research and I'm having some difficult time coming up with comparison. The thing is you have yo compare something complex to something simple > love (complex) is like porta potty (simple). My complex idea what reading body language and my simple idea was perfume, but I'm having hard time coming up with comparison. Does anyone have any other simple ideas I could compare body language to? Unless you have a different structure, then feel free to share. Thanks all for your time and thoughts
Comparing something hard to something easy. Please help!
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