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Parallel projection Facts for Kids. Kiddle Encyclopedia.
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.
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.