What did Lotze identify as crucial for processing the perception of 3D?

Lotze emphasized the importance of touching 3D objects as a key factor in processing the perception of three-dimensionality. His work focused on the interplay between sensory experiences, particularly in how tactile feedback contributes to our understanding of spatial dimensions and object properties.

By physically interacting with objects, individuals can utilize their sense of touch to gain information about shape, texture, and spatial arrangement, which are vital for recognizing and interpreting three-dimensional forms. This hands-on experience enhances perceptual understanding and cognition regarding depth and distance, allowing for a more comprehensive grasp of three-dimensional space.

While visual memory and social interaction can influence perception, and flashing lights can be a part of visual stimuli, they do not holistically encompass the bodily experience and feedback that physical interaction with objects provides. Touching objects allows individuals to form a multi-sensory representation of their environment, thereby reinforcing Lotze's assertion of its importance in the perception of 3D.