I believe that every individual has some personality layers. We are often judged by our outer layer which is "all the time on display". If we peel off carefully all the layers, than we might come to the "central core." By exploring all these layers we can learn about ourselves but also better understand others.
I drew an inspiration from a Dutch saying Not everybody is carved from the same wood. ( I think the english translation could be : we aren't made from the same mold) I see some similarities between the different layers of wood and various and (often) complicated "layers" of a human beings.