The Aperture Science Material Emancipation Grid(or Material Emancipation Grill, or Fizzler) is a testing element in the Portal franchise. It can vaporize, or fizzle, any unauthorized testing apparatus that passes through it. However, it does no harm to the player, aside from the possible vaporization of teeth, or energies, such as the Hard Light Bridge, Energy Balls, and Discouragement Beams. It also blocks portal shots and resets portals. The Material Emancipation grid seems to operate using particle generators, as GLaDOS says, "Incandescent Particle Field."