The human has always recognized the need to make choices among the resources he can have at his disposal. To make use of the resources up to the best expectations mean that the person shall be wise enough to clear the distinction between bad investments and the good ones. With good investments, the human heart gets filled with satisfaction, and without the same he can curse himself to get the most righteous combination he could ever have.
However even after the attainment of the most righteous combination, the person may not be satisfied at all because of the fact that there may still be short comings into the same. The short comings require immediate attention of the owner, and as it may suggest that the owner shall look out for solutions himself.
The house building efforts resemble a same kind of situation, where some empty spaces in the home are left as the owner meets the best offer, he could not do much for those spaces. Unless the doctors closet made their way into the existence, the spaces would have been left ad they are. But now the doctors closet could be used to store things of utmost importance, or could be used as a store room for different necessities as well. The economical behavior of the human here gets realized where the people always try to make the best use of the resources available to him, and exploit them valuably too. Thus thedoctors closets are installed in the homes of the men who want to make their lives highly economical, and make it the best combination for their lives. The doctors closet thus help the person to show their economical behavior, and therefore they stand as a testimony towards the economical nature of the men that hugs the limited resources at their disposal.