Adam Savage builds a brachistochrone curve, which is the same curve as an Isochronous, just with potentially different starting/ending points, with Vsauce's Michael Stevens. It's a pretty bizarre phenomenon: https://youtu.be/skvnj67YGmw
T = 2*pi*sqrt(L/g) = 2*pi*sqrt(1 m / 9.81 m/s^2) = 2.01 s>To make its period isochronous, Huygens mounted cycloidal-shaped metal 'chops' next to the pivots in his clocks, that constrained the suspension cord and forced the pendulum to follow a cycloid arc.[53] This solution didn't prove as practical as simply limiting the pendulum's swing to small angles of a few degrees.