An October 4th, 2013 post to MITnews explains how the cubes with no external moving parts (pictured in the video above), known as M-Blocks, are "able to climb over and around one another, leap through the air, roll across the ground, and even move while suspended upside down from metallic surfaces."
What are the practical applications for these devices?
"Armies of mobile cubes could temporarily repair bridges or buildings during emergencies, or raise and reconfigure scaffolding for building projects. They could assemble into different types of furniture or heavy equipment as needed. And they could swarm into environments hostile or inaccessible to humans, diagnose problems, and reorganize themselves to provide solutions."
Screenwriters and Mighty Morphin Power Rangers Assemble!