Pendulum | World 3 The Talos Principle Guide

Look at the two white balls moving on the same plane with a wall in between them. Put a hexahedron on each of them and on top of that put the connectors. Connect the first connector with the transmitter, second should be connected with button and the first connector.

Jam the ball in the right moment

Now, use the jammer on one of the balls and keep it idle until the other one will get to the opposite side of the path. This will make the beam connection unbreakable. Take the jammer again and open the barrier with the lever behind it.