Avoid using heavy furniture such as big stuff sofas, wardrobes or bookshelves that have closed shutters. Instead if you utilize sofas with sleek frame (like the one in bamboo furniture) this will create more transparency and will help in perception of more space. Also storage units such as TV unit, book shelves if kept open will reveal more wall surface behind them and reduce the "bulky" look. In an interior space that is definitely empty the perception of "small or big" is usually decided depending upon the dimensions of the space. The amount of the space based on the boundaries of floor, walls and ceiling defines the space. The openings in the walls further help in lowering the bulkiness of the space.