This geometric wall shelf unit with a zigzag design is a simple way to add modern storage. To mount it on a concrete wall, I used heavy-duty masonry anchors and a level to keep the stepped tiers straight. The black metal and warm wood panels give it an architectural look. Save this tip for your next shelf project! #geometricwallshelf #zigzagshelf #concretewall #shelfinstallation #modernhomedecor