Encourage climbers to climb. Or conversely, allow them to hang downwards from a height, in which case many of them will attempt to fulfill their real function and will turn the ends of their long trails upwards in the most elegant manner.
Let trailers hang by placing them on a pedestal, shelf, for they look better, more natural this way and give greatest value. Use sprawlers to cover the bare soil area of surrounding pots or to writhe uninhibited across a mantelpiece. Judicious pinching out of misplaced or too strong shoots will keep a bush looking like a bush and encourage a spear-like plant to remain looking this way.
Vivid colours, yellow, orange, white and brilliant red are advancing. They come out to meet you and so tend to make a room appear to be shorter if placed at the far end. And conversely, dark colors, mainly greens of course, are receding and tend to look farther away than they really are, thus lengthening a short room. A tall rubber plant or fatshedera will make a room look higher, for the eye tends to follow the growth upwards, while a high ceiling can appear to be lower if horizontal growing plants catch the eye.
Some of our easiest and most tolerant plants are climbers.
Look at your plants carefully, determine their basic characteristics, shapes and habits and then utilize these to the full.
Remember that warm air travels upwards and the area immediately under the ceiling is likely to be both warmer and drier than at foot level, so where plants are to grow tall or be placed high, increase the relative humidity of the room slightly for their benefit.