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i found another solution: first, get the irised cube. second, set the white cube next to the laser-button, in the room underground, such that, when the vertical portaliable surface deploys, it push the cube on the button. third, put a portal in the main room. fourth, stand on the edge of the auxilliary room (the one with a portaillable corner, a button, and nothing else), grab the irised cube through the barrier, and throw it into a portal put beforhand on the floor of this room. Then the irised cube is in the main room, and we are able to start the laser without loosing acces to main room, and we're done. maybe you would like to adress this, as it is probably not intended :)