You mask an area within range with false scenery visible from outside its area. The area can be as small as a 30-foot cube or as large as a 150-foot cube. Examples of this could be an empty field to hide a fortress; a sleeping ancient dragon to lure away travelers; a cliff which is actually closer than it appears to be; etc. The illusion matches its environment, including the time of day and weather conditions.
Passing into the illusion reveals it to be an illusion, as they're able to see what is really inside of it. A creature that uses its action to examine the scene can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC. A creature who discerns the illusion for what it is, sees it as a vague image superimposed on the area.
Casting this spell on the same spot every day for a year makes this effect permanent.
* - (a blanket)
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