The idea of "Layers"

Layers

my thoughts and interpretations

Layers of life - the cycle of life to death, which could be seen as layers.
The photograph of the flowers represents this through the buds at top, the alive and open flowers in the middle, the older wilting flowers towards the end and to the dead flowers at the bottom.

Layers in art-
layers of paint, this relates to my artist, Jenny Saville.

Layers of clothes.

Layers of food - trifle, sandwich, lasagne, cheesecake, onions for example.

Layers of/in hair.

Other ideas of layers include: 

Layers of graffiti - layers upon layers of paint

Layers in animation - photoshop