Mawson Plateau in the context of Lyndhurst, South Australia

Ephemerality (from Ancient Greek ἐφήμερος (ephēmeros) 'lasting only a day') is the concept of things being transitory, existing only briefly. Academically, the term ephemeral constitutionally describes a diverse assortment of things and experiences, from digital media to types of ponds and streams. "There is no single definition of ephemerality". With respect to unique performances, for example, it has been noted that "[e]phemerality is a quality caused by the ebb and flow of the crowd's concentration on the performance and a reflection of the nostalgic character of specific performances". Because different people may value the passage of time differently, ephemerality may be a relative, perceptual concept: "In brief, what is short-lived may not be the object itself, but the attention we afford it".

Arkaroola Wilderness Sanctuary, commonly known simply as Arkaroola, is a wildlife sanctuary situated on 610 square kilometres (240 square miles) of freehold and pastoral lease land in South Australia. It is located 700 kilometres (430 miles) north of the Adelaide city centre in the Northern Flinders Ranges, adjacent to the Vulkathunha-Gammon Ranges National Park and the Mawson Plateau. The usual way to get there is by car, but air travel can be chartered from Parafield Airport, Adelaide Airport or Aldinga Airfield. It was used as a location set for the 2002 film The Tracker.