Virtually anything published in book form (whether intended for children or adults) that includes three-dimensional or interactive elements to enhance the pictures. Normally, such effects are produced by folding or cutting the paper, hence the term 'paper engineering'.
There are innumerable techniques of which the following are singled out merely as a guide to the main categories:
| TABLEAUX | SPLIT PAGES | 3D EPHEMERA |
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| FLICK BOOKS | PEEPSHOWS | FOLD-OUTS |
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| POP-UPS | PULL-TABS | DISSOLVES |
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| OPTICALS | CAROUSELS | HOUSE BOOKS |
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