We’ll need some additional construc

We’ll need some additional construction lines. We’ll begin below the horizon by drawing a long horizontal a quarter of an inch above the bottom horizontal of these lower blocks. And we’ll draw another an inch above this. Let’s start in the interior of the center block. Along the first horizontal we just drew, measure in a half an inch from the receding diagonal on the left and make a mark. Do the same on the right. Extend long verticals up the page from these points. Use these new construction lines to draw the rectangular front face of a small block inside the larger bottom transparent block. Repeat this procedure to draw a similar rectangle in the blocks to the right and left.