ZigZag is a data model, invented by Ted Nelson, that deconstructs the spreadsheet to allow irregular relations, at the same time generalizing the idea to multiple dimensions.
Instead of conventional linear text or tree structures, zzstructure is a multidimensional extension of a spreadsheet whose cells can contain various kinds of data.
Users can pivot the display about any cell to efficiently "rotate" any unseen dimension in place of either visible one, allowing them to browse high dimensional grids in a zigzag manner.
Since employees are generally required to report new software concepts to their employer, Nelson told his supervisor, Klavs Landberg.
[citation needed] From 2000 to 2003, a free software project GZigZag (later Gzz) developed another prototype with more views and other conventions,[2] but Ted Nelson stopped supporting it.