All three rectangles should overlap one another slightly. (c.) Make a duplicate of the top three shapes and flop the duplicate upside down and center it over the top so the edges overlap slightly.
(d.) Fill all the shapes black. Select the top rectangle and using the Fill Tool, apply an Elliptical Fill dragging the center of the fill to the upper 1/3rd of the shape. Change the fill for the tall ellipse to an Elliptical Fill and drag the center of the fill downward as shown. Make a duplicate of the three rectangles, flop them vertically and align them so that the large bottom rectangle overlaps the top group just a little. Move the center of the fills for the bottom rectangles to the top 1/3rd as shown.
(e.) Make a duplicate of all the shapes. Select all the shapes and select Combine Shapes -- Add Shapes (Arrange menu). If all the shapes overlap slightly, you will have a single continuous outline. If they don't overlap slightly, you'll have what the Icelanders call a dog's breakfast. Apply the same wood grain-type fill that we applied to the base to the duplicate, then rotate the fill 90 degrees so the grain runs vertically.
(f.) Place the wood grain-filled shape over the black and white fountain-filled shapes and apply a Flat, Mix Transparency, amount 50%. Group all the elements.