Virro's Bifrost.

You diffract the beams of light around and solidify them to create a rectangular surface that resembles a rainbow. The surface can be any proportions, but cannot be larger than 30 ft on any of its sides. It has virtually no thickness and must be anchored on at least two points on its sides. The surface does not allow creatures and any objects they are wearing or carrying to pass through, other objects pass through the surface without any difficulty. Additionally, the surface's translucency allows creatures to see through it, it provides no cover from ranged attacks and does not disrupt line of sight.