彩色平面

Quick answer：

A colored plane refers to a flat surface in a two-dimensional space that is defined by a specific color or a set of colors. In geometry, it is often used to represent a surface in a coordinate system, where the color can be used to denote different properties or regions on the plane. In art and design, a colored plane can refer to a flat area of color within a composition, which can be used to create depth, mood, or emphasis.