Long description

This figure represents a hierarchy of layers, although because the structure of the hierarchy is repetitive, three dots are used to indicate that some of the layers have been deliberately left out.

The top rectangle is labelled ‘Layer n’ and is linked to the rectangle below by two arrows. The left-hand arrow points up from the rectangle below and is labelled ‘hides detail from’. The right-hand arrow points down to the rectangle below and is labelled ‘depends on’. This pattern continues, represented by three dots. At the bottom of the figure Layer 1 and Layer 0 are shown.