Researching about the 3D technology I found out a method of seeing in "3D" without using speciall glasses or any instrument. We must focus in a point between the screen and us, making the pictures to build together the 3D image. Try it!
Total lunar eclipse.
It is exhiting to see, and actually also feel, these natural events. It is wonderfull to imagine (and see) the moon, and the earth in movement.