README has screenshot

README.md

 AnimationXBlock
 ===============
 
-Animation. Images with text and a slider. Sliding the slider changes
-images+text.
+This XBlock shows students an animation they can go through. There is
+a set of images with corresponding text, and a slider for going
+through these images:
+
+![Animation screenshot](animation_xblock.png)
+
+This is an intermediate point between video and text. Like text,
+students can self-regulate pace of learning. Like a video, it has
+somewhat reduced cognitive load, since the instructor can "point" to
+things.
 
 Next steps: 
 
-* Discoverability is poor. The tool should either have instructions
-  the first time it pops up, fade-in/fade-out text explaining slider,
-  or at the very least, a tooltip. 
+* This looks good in workbench. There's a css issue where it is
+  usable, but less pretty in edX.
+* The slider uses a third-party library that doesn't seem to handle
+  resizing well.
+* Discoverability could be improved. The tool should either have
+  instructions the first time it pops up, fade-in/fade-out text
+  explaining slider, or at the very least, a tooltip.
 * The slider knob should turn green when done. We add an animation_done 
   class when this happens; the CSS just needs to use it. 
 * There should be an option for no text (if text is e.g. in the image)
+* Conversely, there should be an option to embed XBlocks rather than
+  just text+image. Audio XBlock, in particular, might be nice here. 
 * Nicer styling