According to Yoma 72, actually the Ark consisted of 3 boxes, 2 of gold and 1 of wood. The box of wood lay between the 2 of gold..........(Please refer to Rashi and Yoma 72 for further details)

A question can be asked, why did a wooden box have to separate the 2 boxes of gold ? Whats the significance of this type of separation?

Perhaps , Bezrat Hashem, I can propose an original answer to this question..................................

There exists 2 types of gold, one being "fools Gold" and the other real genuine gold. When a person pursues wealth and luxuries at the expense of Torah and in an unscrupulous way, this is "fools gold". However, if a person fills his or her treasure chest with Torah and Mitzvath, in all actuality this is trully real gold...............A person must be able to distinguish between the two, or otherwise he is doomed to be misled astray and lost...................Therefore a wooden box is placed between the 2 golden boxes that made up the Ark.................Knowing the difference between these 2 types of gold is of upmost importance...............This is essential if one trully wishes to build a very valuable portfolio that is everlasting and tangible ....................Nobody wants to invest their precious time and resources pursuing that which is worthless..........

It says in Mishlei 3:18 the following: "She (Torah) is a tree of life to those who grasp her,and happy are those that hold her tight". A tree is made of wood...........This is the wood that separates "Fools Gold" from Real Gold............Have a Good Shabbos