@article{oai:nagoya.repo.nii.ac.jp:00025986, author = {RUDE, Markus}, journal = {名古屋大学人文学研究論集}, month = {Mar}, note = {Stereograms are double images that yield 3D impressions if observed properly. This paper treats stereo writing and stereo drawing, a technique to produce stereograms manually by observing the emerging structures in parallel view; possibly these structures can already be perceived in 3D, as if writing or drawing would be done directly in a 3D medium. Though feasible, current results lack precision and thus, 3D perception of the product is difficult, locally impossible, indicating that also the process was—at least temporary—not perceived as happening in 3D. This paper treats the specific problem of virtual 3D goal points, the constituting 2D-point pairs of which are often not reached both-handedly, likely since the visual system suppressed one half image, and visual feedback—relying only on a half image—signaled erroneously “goal reached”. Is there a reliable way of sensing that a virtual 3D goal point has been reached, in other words, that the pen tips of both hands reached both of their 2D goal points? The suggested answer is: proprioception can yield such sensing. Writing leaves—besides visual marks—also physical marks, depressions in the paper that can be sensed by the hands: The pen acts as a transmitter for the perturbations of the pen tips entering these paper depressions. An example shows the applicability of the solution. However, also other alternative 2D visual modes had to be used and should be explored in the future for creating better stereograms manually: 3D perception might be rather the result from optimizing the manual production process of a stereogram under parallel view, than the way to produce good stereograms.}, pages = {401--412}, title = {Both-handed Manual Writing in 3D with Visual and Proprioceptive Feedback}, volume = {1}, year = {2018} }