Figure 2: Square

Figure 3: Rectangular and Square

If we only strictly follow the "surface of the article", we can only say the appearance and shape of the article, but not the graphics on the packaging of the article.

Another way of saying this is that the current solutions are groundbreaking, and as long as the shape can be said to be right, it should generally be affirmed.

So according to your supplementary question, any shape that can be said can be counted as right: for example, there are circles, human figures, knife shapes ... irregular figures on road signs and so on. Anyway, as long as you can say it.