Abstract: A translucent construction block assembly, e.g. for a window or wall panel of non-standard size and/or shape, has a frame extending around an array of hollow translucent construction blocks assembled in horizontal and vertical juxtaposition, the blocks each having front and rear walls connected by a peripheral wall and the array having a periphery engaged by the frame so that the blocks are thereby retained in position. The blocks include partial blocks having openings interrupting the peripheral walls thereof, the partial blocks being juxtaposed with the openings at the periphery of the array. A seal of resilient material interposed between the array and the frame extends between the front and rear walls and closes the openings.