Parallel projection facts for kids
In linear algebra and functional analysis, a projection is a linear transformation P from a vector space to itself such that P^{2} = P. Projections map the whole vector space to a subspace and leave the points in that subspace unchanged.
 N. Dunford and J.T. Schwartz, Linear Operators, Part I: General Theory, Interscience, 1958.
 Carl D. Meyer, Matrix Analysis and Applied Linear Algebra, Society for Industrial and Applied Mathematics, 2000. .
Images for kids

Comparison of several types of graphical projection. The presence of one or more 90° angles is usually a good indication that the perspective is oblique.
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Parallel projection Facts for Kids. Kiddle Encyclopedia.