Rational Bullwark

http://en.memory-alpha.org/wiki/The_Cage_(episode)

Rational Bullwark (Abjuration, Cost, Per Scene, Permanent, Requires "Sphere of Force" or "Wall of Force"):  In the days of the long-gone Star League, the Nexialists acquired this formula by the ruthless extraction of recondite information possessed by a race of subterranean mutants. These creatures - whether human or alien - had developed mental powers to the point that they could, through sheer force of will, project illusions that were as solid and substantial as material reality itself. This refinement of intellectual capacities helped the mutants survive numerous environmental hazards in the shelters and warrens below the surface of their shattered world.

This INT-based casting erects a semi-transparent mental force barrier that is able to imprison persons on the opposite side of the force wall projection from the caster. The bullwark can be touched without pain, and will appear to oscillate and resound with a whoom when struck. The barrier is impermeable to physical force as well as to energy weapons, and will not allow a person or thing to pass through it without special counter-abjurative devices.

Rational Bullwark creates a semi-permeable barrier, allowing gas exchange to occur across the barrier without obstruction. It therefore makes an excellent prison cell door.

However, nanite swarms and similar invisible materials may freely migrate across the barrier in both directions.  Spells and spell-like abilities also have some ability to penetrate the barrier, so the caster of Rational Bullwark should make an INT +2 casting roll to determine the difficulty of all future attempts by others to cast spells across the barrier.