Srimathe Rangaramanuja Mahadesikaya Namaha

We have heard Druva Nakshatram is told by known moon and nearby object.

We also understand that example is something which describes unknown from known

Sometimes we say “Girl is like Mahalakshmi thAyar”

Ponnu apdiye Mahalakshmi thAyar madhiri irukka.

Does this example fit into the definition of “example” . ThAyar is known to us or we see the photo of thAyar and say this?

Please explain Swamy

Dasanudasan