The set of tree-named themes (Aspen, Aspen2, Birch) and planet-named themes (Mercury, Venus) build upon an underlying template called UltraWave, which is imported into each of the themes. Do not edit the UltraWave files directly; these are automatically updated with each release. Any changes you make within the UltraWave folder will be lost during upgrade. If you need to overwrite any UltraWave styles, do so within your theme files.
UltraWave incorporates structure and styling for Universal Design. Universal Design seeks to make web content "barrier-free", which means making sites accessible to all challenged users. Those who are challenged include not only the millions who are physically or cognitively impaired but also seniors, non-native speakers, and those in other countries and cultures (localization).
Universal Design has benefits beyond helping sites to meet the myriad of web accessibility standards: it helps to break technology barriers as well as human ones. Universal design is the basis for being able to transform pages and content to into new outputs and displays your members will need in the future, such as print presentation, tablet usage, and even smart phone applications.
Important: UltraWave themes support iPart-based sites, which are an alternative to the Public view. They do not support existing Public views or Admin site.