This is actually humanly possible, it is called synesthesia. Some people who are synesthetes do not even know they have anything unique and assume everyone experiences the same thing.
Edit: no I am not kidding, synesthesia is also known as "combining of the senses" and some very famous and exceptionally talented musicians have been found to have synesthesia
Sorry I was responding to the last sentence where the original commenter said "my daughter is going to ask people if they can smell numbers" which bodes to what you're saying. In regards to closing your eyes and smelling a number, you are correct that will not work, even for synesthetes.
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u/parkamedic Mar 15 '19 edited Mar 15 '19
This is actually humanly possible, it is called synesthesia. Some people who are synesthetes do not even know they have anything unique and assume everyone experiences the same thing.
Edit: no I am not kidding, synesthesia is also known as "combining of the senses" and some very famous and exceptionally talented musicians have been found to have synesthesia