Troblion is an autonomous spherical robot that rolls in an oval partially irrigated sandbox. Following very simple programmed rules the sphere creates a variety of different motion characteristics that can be interpreted as emotions. While it is rolling, it builds a layer of hardened sand on its outer surface giving ability to Troblion to change its appearance as the new skin dries and falls off.
![Troblion [Objects]](https://cdn-ak-scissors.b.st-hatena.com/image/square/b6c7c63e3016cf4f54b2eb8e7237ff1fdbae83b5/height=288;version=1;width=512/https%3A%2F%2Fwww.creativeapplications.net%2Fwp-content%2Fuploads%2F2010%2F12%2Ftroblion00.jpg)