While room design is mostly a matter of taste, there are some basic rules to keep in mind. Today, you'll learn some bathroom design tips and some how-to-avoid-trouble planning tricks. For example, don't overwhelm your space by cramming too much into a small bath (like a big lavish whirlpool tub in a tiny 5 by 7 space). Doing so takes away from the room and is a waste. Also consider safety. Tile is slippery when wet; so add anti-slip coatings, nonskid area rugs and handrails in places water and condensation tend to collect. Also consider who'll be using the room; are they tall or short? This determines the height of everything, from counters to towel bars. Sight lines are important, too; when the door is open, would you rather see the toilet or a beautiful vanity? Don't underestimate the importance of lighting -- both for functional tasks and pure glamour. And that's the On The House Tip for today.