Avoid using heavy furniture such as big stuff sofas, wardrobes or bookshelves that have closed shutters. Instead when you use sofas with sleek frame (like the one in bamboo furniture) this may 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 often decided depending upon the dimensions of the space. The volume of the space based on the boundaries of ceiling, floor and walls defines the space. The openings in the walls further help in decreasing the bulkiness of the space.