This page is about the wonderful world of stereoscopy. Two eyes enable people and animals to view surroundings in 3D. But stereo-pair pictures can also be viewed in 3D. They can be viewed parallel or cross-eyed. Here you will learn how to do it.
This animation shows you how to view stereoscopic pictures.
Rainbow Learn more about why a rainbow is always far away - or is it?
The diverging rays around a rising sun; did you know that they are actually parallel?