Portal: A Dataspace Retrieval, was made by Rob Swigart in 1987, originally as an interactive game for the computers of the time. It was later published as a book, which is still in print and available for purchase. It has been authorized to be uploaded here by the author himself, under the Creative Commons BY-NC-ND Unported liscense 3.0
Please enjoy this excellent work, and I hope I've done a good job in the conversion for you.
V1.1: Fixed some annoying ascii-codes causing such annoyances such as RIGHT SQUARE BRACKET, these have been replaced with the apropriate symbols.
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