Copy of a piece by Ethan Allen. Planning to make five of them for our den, right after I finish a table and a desk.
See the shelves? They are plywood, edged with 1/4" strips. They are prepped for pocket screws, two at each column, one each way, and that is what fixes them in place. The 3/4 x 1 strips that go under the two shelves are aligned with 4mm dominos, and are glued into place after the pocket screws get driven.