The 4th level one is permanent. you build your dungeon with it.
Illusory Wall
Illusion (Figment)
Level: Sor/Wiz 4
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Effect: Image 1 ft. by 10 ft. by 10 ft.
Duration: Permanent
Saving Throw: Will disbelief (if interacted with)
Spell Resistance: No
This spell creates the illusion of a wall, floor, ceiling, or similar surface. It appears absolutely real when viewed, but physical objects can pass through it without difficulty. When the spell is used to hide pits, traps, or normal doors, any detection abilities that do not require sight work normally. Touch or a probing search reveals the true nature of the surface, though such measures do not cause the illusion to disappear.
Silent Image
Illusion (Figment)
Level: Brd 1, Sor/Wiz 1
Components: V, S, F
Casting Time: 1 standard action
Range: Long (400 ft. + 40 ft./level)
Effect: Visual figment that cannot extend beyond four 10-ft. cubes + one 10-ft. cube/level (S)
Duration: Concentration
Saving Throw: Will disbelief (if interacted with)
Spell Resistance: No
This spell creates the visual illusion of an object, creature, or force, as visualized by you. The illusion does not create sound, smell, texture, or temperature. You can move the image within the limits of the size of the effect.
Focus: A bit of fleece.