Interaction with the 3D Necker Cube and Its Depth Shift

Authors created a new optical illusion solid, the 3D Necker cube, which is intended to provide that an optical illusion occurs even when an observer gazes it from various viewpoints with both eyes under room light and the observer can touch it directly. In order to investigate whether an optical illusion occurs inevitably and to what extent touching the physical cube influences an apparent image in an optical illusion, an experiment system was devised including the input pedal detecting three situations. The experiment was conducted under four conditions differentiated from how the finger is moved. The results show that almost all of subjects experienced an optical illusion, and also such an optical illusion occured even when the subject touched the cube directly. Additionally, two groups are found: an optical illusion occurs similarly in all four conditions, and the optical illusion is influenced by touching the cube with a finger.