several outdoor \u201crooms\u201d \u2014 each with a different theme empty spaces can be effective, too use them to draw the eye towards a focal point. 34 glorious pool gazebo ideas. the perfect balance between formality and informality; between nature and human. informal design. unique gallery symmetrical garden design. in this scenario the landscape planting is not only symmetrical but also an extremely formal feeling with its clipped hard edge. asymmetrical balance.