Prototyping impossible objects with VR

Impossible objects are three-dimensional objects that give the impression that it is impossible for such objects to exist in the actual three-dimensional space when observed from a specific view point. The purpose of the present study is to develop a system for prototyping impossible objects with VR, which can be used for prototyping impossible objects as well as evaluating how sure the expected illusions occur when we observe the real objects with naked eyes before molding the impossible objects using 3D printers. We have implemented our prototyping system with Unity and C# programming language for use with Oculus Go. The advantage of employing VR in prototyping impossible objects is that we can take into account the scale effect when we evaluate how sure the expected illusions occur.