The eye of conjuration

By touching an object a invisible eye appears. Using this eye every time the creature closes their eyes they can see everything the eye can see, per spell level used the time will increase by 6 hours 

(note that the concentration is for the invisibility and not the eye itself but the eye will disappear after 24 hours + 6 hours per spell level, if the spell is casted again the creature can only see through that last one casted and the last will disappear, and lastly if the object  breaks where the eye is the creature will take 1d4 damage and the spell will end)