I’ve been a builder for almost 20 years of my life. Ever since I was a toddler I have been building things. And over these many years of expertise xD I have come to some conclusions. 

When building things in certain construction mediums, there are certain numbers and ratios of numbers that become advantageous to use. For instance, when building with Lego, numbers like two, four, six, 8, 10, 12, are useful since the base brick is a two by four. I.e, Two studs by four studs. An exception to this is anything to do with the minifigure, since the mini figure is about three studs wide and five studs tall additionally most lego doors are four studs wide to accommodate the 3 stud wide figure) . This means that any kind of house or building you make should be an even number wide and an odd number tall. 

5 studs tall/6 studs wide or in a more general term (any odd number)/(any even number)

You could also look at the relationship between the figure itself and the bricks on either side of it. A mini figure in a structure of basic bricks needs a space that is at least four studs wide. There is an exception to this rule if one uses different bricks but for the purpose of this explanation we won’t get into that yet. But the minifigure is 3 studs wide, why does it need at least a four studd difference? Because the figure has a base of two. The figures width is transferred from an odd number of studs to an even number of studs. Hence the need for the ratio of odd, over even. And since most of the bricks in lego are based off of the figures, most of the bricks in lego work on the principle of odd numbers/even numbers. 

There is a similar principle in minecraft except it is somewhat reversed. 

The “bricks” in minecraft are based around an equilateral parallelogram. Aka a square. One door in the game has the width of one block. Therefore, if someone is building a house, than to have a symmetrically pleasing exterior the house must have an odd numbered wall. But, since the door is two blocks tall to alow the hight of the player to pass through, than the heighth of builds is typically an even number of blocks tall. Or, an even number/an odd number. Minecraft relies on imperfect fractions to make builds look esthetically pleasing. Infact one of the important numbers in Minecraft detailing is 3. Bedoubleo100 is a Minecraft Youtuber who has is own rule that he fallows. When detailing a flat wall, he tries to make sure that every three blocks there is at least some sort of detail to break up the wall’s flat appearance. The interesting thing about this number is that it is the same number used in the minecraft three by three crafting grid. 

Numbers pop up all over construction. Infact in carpentry one of the base numbers that pops up is the 2 by 4. A standard sized board used heavily in construction of houses.Infact, its not just us humans who do this, nature also uses numbers and ratios like this. For instance trees use fibonacci’s sequence to determine the optimal placement of their leaves to gain maximum light exposure.  These ratios simplifi construction because it takes numbers that would be unique an infinite number of times and making them something that can be used very quickly across broad implications with minimal representation of those infinite numbers.