Stereoscopy is a photographic and visual technique used to create the illusion of three-dimensional depth on a flat, two-dimensional surface. It works by capturing two images of the same subject from slightly different viewpoints, corresponding to the distance between human eyes. When these images are viewed through a stereo viewer or other 3D viewing device, the brain fuses the two perspectives into a single image that appears to have depth and dimensionality.
Stereoscopy has been applied in a variety of fields, from early photographic experiments and educational tools to modern 3D movies, virtual reality, and scientific imaging. It allows photographers and viewers to experience a more immersive representation of space and form, revealing spatial relationships and distances that are otherwise lost in standard two-dimensional images. Proper alignment and careful capture of the image pair are essential to achieve a convincing and comfortable 3D effect.