Perception serves as the foundational step in constructing the digital world. Only by capturing the features and information from the real world can we reconstruct it in the digital realm.Just as the eyes are the key sensors for humans to gather external information, imaging systems act as the eyes of AI to capture and process visual features of the real world.Also，As an ill-posed inverse problem, 3D reconstruction infers three-dimensional information from two-dimensional observations, relying on discrete point clouds to represent 3D geometry. Thus, point clouds serve as a crucial medium through which AI observes, interprets, and reconstructs reality in the digital domain.