the one down the stone stairs when you first enter this level and the one just across the platform in the water

go up the little path to the day/night circle and step on it two times. It will go from night to day and then from day back to night.

You must position the hands to go straight across to the other side. Then you must position the hands to go from there to the platform on the right. When you get to the platform on the right, go down the little path on the right and activate the pedestal down by the water. Not sure what else after that as that will be what I need to figure out. What happens is the hands will then allow you to jump down to a place where you can turn the plank in the water.

[/spoiler]At the begin when you have pushed the button to raise the hands go back to the stone arch, make it daytime.
Click on bothpedestals, that is possible because they are active at different times.
Now make it night again, the hands are turning. Walk over the hands to the other side.
Walk to the top of the stairs and then left to the day/night disc. Make it daytime, you can now walk over the hands to the platform on the right.
On that platform walk through the stone arch and then turn right, walk to the water and click on the pedestal there.
walk back up and go to the day/night disc, make it night. Step of the disc and back on againto make it day again.
Now you can walk over the hands and jump on the beam in the water, walk through the waterfall and push the button.
The beam is now turned.
You can't walk back here so walk on and jump down, you are back at the day/night disc.[spoiler]