A louver includes an integral core having first and second opposed surfaces. There is a layer provided on at least a portion of at least the first surface of the core. The layer has a design pattern with a plurality of projections extending away from the core. The louver is also provided with an array of light-traversable perforations extending through the core and the layer. An assembly that has a support mountable to a frame of an opening and a plurality of louvers. The louvers are mountable relative to the support so that the louvers cover the opening. The assembly also has rotation members for rotating the louvers between a closed position and a partially open position and a fully open position. The projections combined with the perforations allow the louvers to present improved light transmission-reflection effects particularly when rotated.