"Hollowmaskillusion"isanopticalillusionandappearsduetoanerrorintheprocessofreconstructingthethree-dimensionalobjectsfromourtwo-dimensionalretinalimage.Inthispaper,wepresentacomputationalmethodtocreate"Hollowmask"typenewillusionarysolidbycalculatingthehollowstructureanditsshading.ThestraightlineVoronoidiagramforagivenshapeobtainsthethree-dimensionalverticesofthehollowstructureandtheshadingeffectoneachsurfaceiscalculatedundertheassumptionthateachsurfacehasdiffuselyreflectingsurface(Lambertianreflectance).Wealsoshowtwoexamplesofournewillusionarysolidworks.
