I want to create a meshed object like the pic below. (Please ignore the coin besides it.)

The thing is, I want to set a light behind the meshed object and make the light scatter through the meshes. (it's almost like a lamp below.)

The camera will be located right in front of the meshed object, so the object itself doesn't need to be a 3d cube like this pic though.
I'm very new to three.js and was not able to find a way to make a object like the one described above.
            geometry = new THREE.BoxGeometry(1, 1, 1);
            material = new THREE.MeshPhongMaterial({ color: 0x000000 });
            box = new THREE.Mesh(geometry, material);
            scene.add(box);
Could anyone advise me how I can I achieve this?