Raichlen notes that waves can be moving or stagnant boundaries. Strayer’s writing portrays a much more hardline sort of boundary; most boundaries are investigative or tangible, with few in between. For example, for a fish, the shoreline is a very “hard” boundary in which the water recedes and a fish can be trapped or killed in shoreline pools. In contrast, Sze’s writing outlines a boundary that is much more loosely and lightly defined; for example, the delta is shaped by other people’s desires and is a “social production of nature”. The delta brings together different political, social, and environmental viewpoints.