Stone of Thought
The Stones of Thought provide a telepathic link to Murfy. Whenever Rayman needs a little help or advice, he should approach one of the Stones, and Murfy will appear in his mind.—Manual, Rayman 2
A Stone of Thought is a square stone that is found in some places in Rayman 2, most notably the Woods of Light. They teach Rayman how to perform his abilities by reading his mind, and when he first comes near one, Murfy will appear to explain these lessons the Stones bear. In most versions except for the PlayStation version, where it is Ly who gives Rayman the lessons, the Stones have the face of Murfy carved on them.
Rayman on a Stone of Thought.