Veil

The veil spell enables the illusionist to instantly change the appearance of his or her surroundings and/or party or create hallucinatory terrain (q.v.) so as to fool even the most clever creatures unless they have true seeing/sight, a gem of seeing, or similar magical aid. 

The veil can make a sumptuous room seem a filthy den and even touch will conform to the visual illusion. If hallucinatory terrain is created, touch will not cause it to vanish.