I wonder if you have seen a square formation on the 50th anniversary of the founding of the People’s Republic of China? It’s very impressive and neat?

1. More than 200 people walked together?

2. Step together?

3. The people in the front in a triangular shape walk in unison (goose-stepping). This queue requires about 1/4 of the people?

4. The people in the middle are in a straight line. To walk in parallelogram (goose-step), this queue requires about half of the people?

5. The remaining one-quarter of the people then walk in a triangle?

6 , will it finally be combined into a square matrix?

To sum up, a rectangular square matrix is ??first cut off at a right angle, and then cut into a right angle again, and a parallelogram is formed in the middle.