SitePrism gives you a simple, clean and semantic DSL for describing your site using the Page Object Model pattern, for use with Capybara in automated acceptance testing.
The Page Object Model is a test automation pattern that aims to create an abstraction of your site's user interface that can be used in tests. The most common way to do this is to model each page as a class, and to then use instances of those classes in your tests.
If a class represents a page then each element of the page is represented by a method that, when called, returns a reference to that element that can then be acted upon (clicked, set text value), or queried (is it enabled? visible?).
SitePrism is based around this concept, but goes further as you'll see below by also allowing modelling of repeated sections that appear on multiple pages, or many times on a page using the concept of sections.