PoliceBox63 said:
Tspoon said:
Fire a portal through ANOTHER portal.

You can't
Hypothetically, objects such as Chell, cubes, radios and rockets can move through linked portals maintaining their momentum and angle. Why, therefore, can you not fire a portal ray through linked portals?
Say, for example, you have a blue portal at your level, and a linked orange one five metres above you. Opposite the orange portal is a flat surface you can place a portal on. According to a theory I know, in real life, you should be able to shoot a ray of either colour through the link, and create a portal on the surface opposite the orange portal.
The game treats portals as if they are a part of the wall, and a portal, linked or not, is treated as being unlinked when rays hit it. So when you attempt to do this in-game, the ray either fails or creates a new portal, depending on colour. In real life, however, I believe that either ray would pass through linked portals the same way anything else does.
OT: Say goodbye to public transport. I'd pop one on a wall of my local mall, and another at my university. Since I live five minutes away from the mall, I'd never be late for a lecture again.