When the Close packed layout option is selected and Files added, EscapeE automatically draws clip-regions around non-blank objects such as lines of text. These clip-regions are rectangular and trimmed of blank (white) pixels. They are placed one after the other down the page(s) with no vertical space between clip-regions.
This is useful for gathering lots of disparate pieces of information together in the minimum of space as a resource document, rather than as a finished document for general publication.