Recent conversation about metalurgy I had lead me into conclusion that people do not pay attention to detail and tend to simplify things to a ridiculous level. This exercise may help You to avoid this problem.
So here it comes:
Any time during the day, when You have nothing better to do, or just feel bored, take a random object from the surrounding, take a good look at it, study it well for few minutes. After You are done with that, turn you back on it (or just hide it in a pocket if it is more comfy), take few deep breaths and describe it on a piece of paper- be specific, exact, describe all you can, from the color to size. After You are done, compare the real object to that little essay You just made. At this point You may be really surprised.
So You may ask what is that nonsense good for. Well, it will make You more careful, aware and conscious. Ant those assets will help You for example understand why You can not make a certain spell to work.