First, according to the shape of the figure, it can be divided into circle, triangle and square.

Second, according to the color classification of graphics, it can be divided into: one is painted blue and the other is not painted blue.

Thirdly, according to the classification of surface graphics, it can be divided into: circle is one kind, square and triangle are one kind.

Extended data:

(1) Simplex takes a single geometric figure as the whole trademark. This kind of example is rare, mostly the deformation of the basic figure.

(2) Fractal divides a basic geometric figure into several parts (equilateral triangle is divided into three parts) Figure 5 (Pentagon is divided into a triangle) and Figure 12 (circle is divided into upper and lower parts).

(3) Similar (identical) groups are composed of several similar or identical basic geometric figures, as shown in Figure 1 (composed of three isosceles trapeziums) and Figure 2 (composed of three equilateral diamonds) and (composed of five perforated circles).

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