Sheikah Stone

A Sheikah Stone is an object featured in Ocarina of Time 3D. These stones are similar to appearance to the Gossip Stones from the original game, except that they are larger and the Sheikah Symbol is outlined in a bright green color, with a passage at the bottom for entry.

Location and Uses
One Sheikah Stone can be found outside Link's house, and the other in the Temple of Time, presumably because these are the two potential starting points upon resuming a saved game. If Link talks to one, he will have the option to crawl inside it to bring up the Visions screen. From here, the player can choose one of the Visions listed and get hints on how to complete a specified puzzle, find a secret, or defeat a boss - provided he has reached a point in his quest close to accessing the subject.

They are absent in the Master Quest version of the game.