Abstract: A roller shutter for a window or doorway wall opening, comprising a plurality of elongate slats coupled together to form a slat assembly, and a winding device overlying the slat assembly for winding and unwinding the slat assembly to a fully-closed position, a fully-opened position, and a partially-opened position with respect to the wall opening. The slats are coupled together by flexible coupling links coupled between adjacent slats at both ends of the slats, which permit each slat, when in a fully-opened or partially-opened position with respect to the wall opening, to move linearly away from an adjacent slat in the slat assembly to create a light and air space between the adjacent slats and linearly towards the adjacent slat in the slat assembly to close or restrict the light and air spaces, and angularly with respect to the adjacent slat in the slat assembly to enable the slat assembly to be wound onto or unwound from the winding device.