A "presentation" is a timeline widget displaying two or more timelines simultaneously.
Along with some presentation metadata, multiple timelines can be loaded in in the data_source (JSON) array:
{
"presentation":"Timeglider",
"title":"My Presentation",
"description":"Description of combined timelines",
"open_modal":true,
"initial_zoom":49,
"image_lane_height":100,
"focus_date":"1950-06-12 12:00:00",
"initial_timelines":["mr_life", "hj_life"],
"timelines":[
{"id":"us_general", "title":"U.S. History",..."events":[...]},
{"id":"idaho", "title":"History of Idaho",..."events":[...]},
]
}
Take a look at the JSON for this presentation.
Timelines can be (using a "bottom" property), and inverted (either true or false) such that two timelines can be "bookmatched" with inverted timelines being laid out from top to bottom, and positioned below a timeline with the default (non-inverted) bottom-up placement of events.