Ah, Varisen's cube.  A curious device, if one can call it that. First discovered, not created, I must clarify, by Grand Magus Varisen.  Its nature seems to be that of infinite.  Roughly 6 inches on all sides, when one peers through the cube, they can peer through one of the pinpricks in the dead center of any of its faces.  But be wary of careful of where and how you look.  You will see through it much like a telescope, except through another time.  How long?  Future or past?  That is uncertain.  The cube rarely likes to remain in place for long, but what research we have managed to accomplish suggests that which face, and the angle that the cube is peered through are all factors.  Once you take your eye away from it, even if it has been tilted a fraction of an inch, looking through could reveal something weeks, months, centuries, or nanoseconds instead.