Bermuda migrates towards wetter soil. If flower beds are kept wetter than the surrounding lawn, Bermuda will easily invade them. Using sunken concrete mixing tubs as liners for beds can prevent this migration, underground. Keeping above ground migration at bay is much easier.
In this backyard studio, the interior has been covered in plywood and a large window gives you a perfect view of the pond. In front of the window, there's a sunken day bed allowing you to almost sit at eye level to watch the ducks. A group of plywood boxes have been designed to 'infill' the sunken section and provide a consistent floor level when the space is being used for gatherings and parties.