The Wall extension is based on wall.js by Michael Braun. https://github.com/broen/wall.js
wall.js is a 3D wall gallery to display images in creative way. If you clicked the image, it will show in a basic lightbox.
You can download the new extension through the Extension Manager (Menu->Tools->Extension Manager->Online Gallery).
or here
http://extensions.quickandeasywebbuilder.com/
PDF documentation is included in the download.