Click the Play button located at the bottom-right of the applet. [br][br]This is my first attempt to learn GeoGebra 3D. This is clearly inspired by Diego Lieban's seesaw here: [url=https://www.geogebra.org/m/n6cdFkHD]https://www.geogebra.org/m/n6cdFkHD[/url]