第一要前后相应，所谓前后相应并不是要求前后两面完全一样，而是有正面有反面，这样既有区别又有呼应，从而达到前面美观，后面也比较美观的程度。尤其是当我们从侧面观看时，是最容易检验出这种前后关系的效果的。

The second is to match the upper and lower, the so-called upper and lower proportions, is to make the shape of the body up and down the proportion of coordination. This coordination does not mean an upper and lower average form, but a symmetry of upper and lower combinations. Make it just right, make people feel comfortable, and reduce the weight of the head or weight.
Third, the left and right are connected. The so-called left and right connection means that regardless of whether the shape and structure form are in accordance with the symmetry law or the equilibrium law, the left and right parties must be connected, closely related, and become one, rather than isolated and separated from the left and right from the part.