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diff --git a/dev/a4-dance/motion_clip.h b/dev/a4-dance/motion_clip.h
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+
+#ifndef ANIMATION_CLIP_H_
+#define ANIMATION_CLIP_H_
+
+#include <mingfx.h>
+#include "pose.h"
+#include "skeleton.h"
+
+
+/** A MotionClip is a series of poses that can be applied to an animated character.
+ In addition to storing that list, this class provides some utility functions for
+ editing the clip, including triming unwanted frames from the front or back or 
+ prepended or appending additional frames to the clip.  You can also make the clip
+ loop smoothly. */
+class MotionClip {
+public:
+    /// Creates an empty clip.
+    MotionClip();
+    virtual ~MotionClip();
+
+    /// Loads a clip from a file in the AMC mocap data format.  A reference to
+    /// the skeleton used during the data capture is required in order to know
+    /// the proper bone names and hierarchical arrangement.
+    void LoadFromAMC(const std::string &filename, const Skeleton &skeleton);
+
+    /// Adds a single pose to the beginning of the motion clip, shifting all
+    /// frames later by 1.
+    void PrependPose(const Pose &pose);
+
+    /// Adds a single pose to the end of the motion clip.
+    void AppendPose(const Pose &pose);
+    
+    /// Combines this motion clip and another by prepending the other.  If you
+    /// wish to smoothly blend (i.e., cross disolve) between the two clips, then
+    /// use a value > 0 for num_blend_frames.
+    void PrependClip(const MotionClip &clip, int num_blend_frames);
+
+    /// Combines this motion clip and another by appending the other.  If you
+    /// wish to smoothly blend (i.e., cross disolve) between the two clips, then
+    /// use a value > 0 for num_blend_frames.
+    void AppendClip(const MotionClip &clip, int num_blend_frames);
+
+    /// Turns the motion clip into a continuous loop by blending the last
+    /// num_blend_frames/2 poses with the first num_blend_frames/2 poses.
+    void MakeLoop(int num_blend_frames);
+
+    /// Removes some poses from the front of the motion clip.
+    void TrimFront(int num_frames);
+
+    /// Removes some poses from the end of the motoin clip.
+    void TrimBack(int num_frames);
+
+    /// Runs through the motion clip, frame by frame, and calculates the relative
+    /// translation from one frame to the next, storing the results in each pose.
+    /// This is not needed if the motion clip will only be used for playback in
+    /// an absolute positioning mode, but it is needed for playback in a relative
+    /// positioning mode.
+    void CalcRelativeTranslations();
+
+    /// Returns the length (in number of frames) of the motoin clip.
+    int size() const;
+    
+    /// Returns the character's pose for the given frame.
+    Pose pose(int frame_num) const;
+
+    /// Returns the character's pose for the given frame.
+    Pose& pose(int frame_num);
+    
+    /// Returns the character's pose for the given frame.
+    Pose operator[](const int frame_num) const;
+    
+    /// Returns the character's pose for the given frame.
+    Pose& operator[](const int frame_num);
+    
+private:
+    std::vector<Pose> frames_;
+};
+
+#endif