You should have a good feel for the 3-D space about you as you stand on the table in your dinning room. What fun! Didn't you always want to get away with something like this as a child. I guess that most kids spend their time under the table instead of on top, so you get a little advantage.
Now move to the first chair position [carbon 1 atom] and get ready to extend your bucket arm out the window. Remember that it is at this first chair position that the nitrogen [N] atom connects to your table. It is this nitrogen [N] - carbon [C] connection that gives the name to this nitrogenous base that you are about to extend out the window. You have certainly seen one of these bucket trucks with its arm extended. Now take control and place your bucket out the window. If your bucket contains an "A" letter [adenine], you will have to find a "T" bucket [thymine] on the other side. If your bucket contains a "C" [cytosine], you will have to find a "G" [guanine] bucket on the other side. Amazing that after billions of years, the "A" to "T" and the "C" to "G" connection seems to be the best way to transmit our genetic information.
As you look out the window to extend your bucket you will notice something strange about the floors across from you. They are stacked in the opposite direction. The fellow extending his bucket out his window directly across from you will appear to be upside down. What in the biochemical world is this? Well, the opposite series of rooms are arranged exactly like your dinning room except they are heading the opposite direction. In the world of rooms stacked opposite, their world is right side up, and you are upside down. In this 3-D space, it will depend on where you are standing to determine which direction is up! At any rate, the rooms across from your set of parallel rooms run in the opposite direction. I guess this utilizes biochemical space to the maximum, and allows the buckets to be place between each series of floors.
Anyway, you have to find your match as you extend your bucket out the window. Once you find your mate, you hold hands with your partner. Now if you climb into the bucket yourself, you will see a whole world of buckets holding hands up and down between the two sides of rooms. As far as the eyes can see, bucket after bucket holding hands with its partner. What a sight. The holding of hands represent the hydrogen [H] bonds that keep the buckets connected when they are not being used. The buckets take a twist as they hook up giving the form of the double helix, which is the final structure that houses out destiny. What a bucket list.