Like ancient standing stones, it would be my intention to place the solar system planet spheres over a large area with some relationship to the scale of distance of the real solar system making the Sun sundial as the centre piece. The spheres could be placed at different ground heights in the landscape to reflect the different planet's positions in 3 dimensional space. Some spheres could be hidden to encourage exploration of the landscape and connect up different areas, like a sculpture trail. Planting could be used to enhance the layout. A planet could be placed in the water?