The Reverend Dr. Lauren Artress described walking a Labyrinth as a "liminal" experience.
In social and cultural theory, Victor W. Turner defined 'liminality' as moments 'betwixt and between' fixed cultural categories.
The beach of an ocean can be classify into categories.
The foreshore is the area of the beach between the average high and low water marks. It is covered and uncovered as the tide migrates. The seaward side of the foreshore is the nearshore, which is below the level of the low tide. Behind the foreshore is the backshore, it is above the the level of the high tide.
Symbolically then, because it is between the nearshore and the backshore, the foreshore can be used to represent liminality, a 'betwixt and between' place.