  We discuss some basic principles of stereoscopy and their relevance to the
reconstruction of coronal loops. The aim of the paper is to make the solar
physicist familiar with basic stereoscopy principles and to give hints how they
may apply to the analysis of data from the forthcoming STEREO mission. We
disucss the geometry of the solar coronal stereo problem, give the basic
principles of a tie-point reconstruction algorithm and consider ambiguities and
resolution errors. Finally we mention extensions to plain stereoscopy such as a
third view, a tomography-like approach and how magnetic field information can
be used to improve the reconstruction.
