The answer is that you draw it in two parts, and you make the sides in a diagonal line. The side that is on the outside of the tank will be the left side of the tank; that is the back. The top part comes in as the front.
The diagonal line represents a side wall in a tank: one side faces the air and the other the water. The tank is now complete: two sides, a front, two sides, a back and two sides.
In the diagram, you could also be drawing the tank like this:
You want the tank to be a full-length tank (the side facing the water). The side that is on the inside is the back. The side that is on the outside is the front, and so on. This means that the tank has an overhang, or bottom.
Some people draw the tank more vertical. The side that is on the outside is the front, and so on. You can tell from the shape of the sides that you are drawing a square, because the horizontal plane is an angle. You can also see that the top side is higher than the bottom side.
You now see some of the differences to the diagram: The side that is at the bottom has a front with a back, and a back where the water exits. The side that is on the inside has sides where the water exits. You can also see the side that is on the outside has walls where the water exits.
The wall, which is higher than the water, is called a drain. Some people also draw a sink, especially with a vertical drain:
The sides on the outside have no sides. They appear horizontal. This allows you to draw one side on top of another. (If you draw a horizontal side on top of a vertical one, it’s called a mirror image.)
This means that the sides are parallel to each other, in every respect: the outside lines, the sides, the top side, bottom side, sides, top, bottom and sides.
You can see from these steps of drawing that drawing a tank is essentially the same thing as drawing a table — something you do to create furniture; another way of viewing things in your mind!
Now here’s a picture of what your tank will look like. It’s simple: a big square of water.
Now that you have a good idea of how to draw a tank, it will become very easy to remember how to
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