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Layman - (noun) - 1: a person who is not a member of the clergy; 2: a person who does not belong to a particular profession or who is not expert in some field.

Figure 1             Figure 2.

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String theory is quite fascinating if you are not a layman in quantum mechanics (see figure 1).  If you are layman in quantum mechanics, then figure 2 makes more sense.

For more information - https://www.dictionary.com/browse/layman?s=t

For more information on String Theory - https://en.wikipedia.org/wiki/String_theory