[[Image:The_slip.jpg|thumb|200px|Halo 27: ''The Slip'']]
'''''The Slip''''' (also known as '''''[[Halo numbers|Halo 27]]''''') is the eighth and latest studio album from [[Nine Inch Nails]]. It was released as a free download on May 5, 2008, and contains the previously released Web-only singles "[[Discipline]]" and "[[Echoplex]].
The album is available for download in a variety of formats, including MP3, lossless FLAC and high-quality WAV files. When playing the MP3 files in an MP3 player a different piece of artwork is displayed for each song, [[The_Photography_of_Ghosts_I%E2%80%93IV|as was the case with]] ''[[Ghosts I–IV]]''.
Like ''[[Ghosts I–IV]]'', the release of ''The Slip'' came as a surprise to most fans, who were expecting the next release to be a "''Year Zero 2''". Trent Reznor has indicated in interviews since the release that a ''[[Year Zero]]'' sequel was still in the works.
It remains unclear what portions, if any, of ''The Slip'' should be considered as canon in the Year Zero storyline. Aside from from [[Art Is Resistance]] logo in the artwork for "Letting You", there are no clear direct references characters or events in Year Zero. Many of tracks do share similar themes, such as abuse of power ("Letting You"), an avatar of destruction ("Demon Seed"), submission to authority ("Head Down"), imprisonment ("Echoplex") and the appearance of entities in the sky ("Lights In The Sky"). Other songs, however, like "1,000,000" and "Discipline", seem completely unrelated and feature more "traditional" NIN themes of personal turmoil. However, through analysis of the lyrics and with consideration of the Year Zero theme. "1,000,000" could be about fleeing from authorities after committing offense in a totalitarian universe. "Discipline" could be a soldier or citizen trying to keep in line and not get caught. The song "Letting You,
" could be the abusive power saying that they want to use one citizen's escape so that they can find the rest of the resistance.
There also seems to be a mistake in the wave files; The track "The Four Of Us Are Dying" is mistitled "Demon Seed" and vice versa.
The final page of the PDF gives credit to "(c) 2008 niin.
" This appears to be a typographical error.
Audiophile message board [http://www.hydrogenaudio.org/forums/index.php Hydrogen Audio] noticed mastering errors on the 24/96 high-def WAVs, which was followed by posters "ningineer" and "treznor" who wrote that they had recontacted the mastering studio and released the WAVs in addition to high-def FLACs.[http://www.hydrogenaudio.org/forums/index.php?showtopic=63086] On May 15th the nin.com Halo 27 blog post was edited with the message: ''"Some friends at hydrogenaudio pointed out an error with the high resolution WAVE files we didn't catch. The corrected files are now posted along with high resolution FLAC files as well. If you're interested in these, simply re-download the new files. Sorry for the hassle!"''