You cover a 90-foot cube with thin images. The images can only be superimposed up to 1 inch above solid surfaces or objects. The images must not be a creature and must appear solid. The images travel with the things they are superimposed on. A thing losses its part of the illusion if it travels outside the 90-foot cube.
The illusion also includes audible, tactile, and olfactory elements that are appropriate to the things being depicted. For example, if you turn a stone floor to wood it will creak when walked over, feel smooth instead of bumpy when touched, and the scent of wood will permeate the air. However, these elements are still illusive and do not add or remove properties to the things they are attached to. For example, you cannot make an area more or less harmful than it already is. You can’t create an object sharp enough to do piercing damage or a sound loud enough to deafen a creature. You also can't make things weaker or stronger than they actually are and can't make something into difficult terrain or vice versa.
Contradictory sensations, such as cushioning doing piercing damage, are likely to cause a creature to see through the illusion. Alternatively, if a creature carefully examines the illusion, they can attempt an Intelligence (Investigation) check against your spell save DC to disbelieve it. A creature who discerns the illusion for what it is, sees it as a vague image superimposed on the area. However, even when the illusion is revealed, all other elements of the illusion remain, so while the creature is aware of the illusion’s presence, the creature can still physically interact with the illusion.
If the same illusion is casted every day for a year, the illusion becomes permanent until dispelled.
* - (a bit of fleece)
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