Surface of constant width

ag.algebraic geometry - Algebraic surface of constant width? - MathOverflow

Rotationally symmetric algebraic surface of constant width — Geometric Models Collection of V.N. Karazin Kharkiv National University

Curves and Surfaces of Constant Width - Wolfram Demonstrations Project

A New Solid of Constant Width - Online Technical Discussion Groups—Wolfram Community

Examples and Constructions

THE ULTIMATE SOLID OF CONSTANT WIDTH — Matter Collection

ag.algebraic geometry - Algebraic surface of constant width? - MathOverflow

Ghrosty & Schuff

Reuleaux tetrahedron - Wikipedia