I personally know the struggles of trying to build a 3D shape with the black concrete block. Eventually, it all just blends into a solid blob of black until you aren't even really sure if it's the shape you were trying to build. That is why I have created a very simple little pack you can throw on when building! The pack adds a bright outline around the edge of the black concrete block, making it much easier to tell blocks apart. When you're done building, you can take it off, reassured that what you've built is correct!