Today I moved my copper pipe pyramid. It was out of alignment (for some time already) after a minor collision between it and my tractor.
I used my cell phone compass to align it, weird thing is that the compass kept on moving 10 degrees either way and would not settle on the magnetic north.
When I placed the cell phone outside the pyramid it only moved a couple of degrees back and forth.
Now that it is properly aligned again I will have to try the cell phone inside the pyramid again.