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diff --git a/src/main/scala/sims/collision/AABB.scala b/src/main/scala/sims/collision/AABB.scala
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+++ b/src/main/scala/sims/collision/AABB.scala
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+/*
+ * Simple Mechanics Simulator (SiMS)
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package sims.collision
+
+import sims.geometry._
+
+/**
+ * Axis Aligned Bounding Boxes (AABBs) are rectangles that frame a shape.
+ * Their X-Axis and Y-Axis orientation makes it easy to test two AABBs for overlap.
+ * @param minVertex Position vector of the bottom-left vertex
+ * @param maxVertex Position vector of the upper-right vertex
+ */
+case class AABB(val minVertex: Vector2D,
+                val maxVertex: Vector2D)
+{ 
+  /**
+   * Checks this AABB with <code>box</code> for overlap.
+   * @param box AABB with which to check for overlap*/
+  def overlaps(box: AABB): Boolean = {
+    val d1 = box.minVertex - maxVertex
+    val d2 = minVertex - box.maxVertex
+    !(d1.x > 0 || d1.y > 0 || d2.x > 0 || d2.y > 0)
+  }
+}