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+[![Build Status](https://secure.travis-ci.org/diagrams/active.png)](http://travis-ci.org/diagrams/active)
+
+This package defines an `Active` abstraction for time-varying values
+with finite start and end times.  It is used for describing animations
+within the [diagrams framework](http://projects.haskell.org/diagrams). 
+
+To install,
+
+    cabal install active