I don't try to compete with large cabinet outfits for kitchens, etc., but occasionally something interesting- curves, fancy veneers, unconventional engineering- comes along. Bathroom vanities; a pool-house (!) media cabinet. A violin shop, with fixtures made of the same highly-figured maple used for their instruments; a towering bookcase of solid walnut, planks ten feet long, fastened with a system of hidden cleats so the shelves seem to float over the wall.
For this walnut bookcase I didn’t want a vertical member against the wall (right-hand side), but rather, to have the shelves “disappear” into the corner. This required some arrangement that would withstand the considerable weight of the books, but not detract from the disappearing act. The solution was aluminum L-channel, cut and bent to conform to the not-plumb, not-flat wall, let into the bottom/ back of each shelf, and toggle-bolted to the wall at frequent intervals. Painting with a walnut-hued enamel (screws too!) produced a stout and discreet means of support. Sometimes the engineering is the most satisfying part of the job