Objects representing <a href="https://en.wikipedia.org/wiki/tautochrone_curve" class="extiw" title="w:tautochrone curve">tautochrone curve</a>
Exhibition made by Tadeu Costa, photo by <a href="//commons.wikimedia.org/wiki/User:Rodrigo.Argenton" title="User:Rodrigo.Argenton">Rodrigo Tetsuo Argenton</a>
CC BY-SA 4.0
Matemateca (IME/USP), provided via digitalization project by the user: <a href="//commons.wikimedia.org/wiki/User:Rodrigo.Argenton" title="User:Rodrigo.Argenton">Rodrigo Tetsuo Argenton</a>