This is an old revision of the document!
Obelisk is a new project the developers of Sia have been teasing. Nobody (except the dev team) knows what it's about yet.
More information about Obelisk will be gradually released during the week of 19 to the 23rd of June. Lead developer David has promised that by the end of Friday everyone will know what Obelisk is all about.
All currently available information has been leaked through the #obelisk channel in the Sia Slack community (see the sidebar for a link to join the Slack).