I was looking at a timeline of Seleucid and Ptolemaic rule and I was trying to get a feel for the relationship in time of when Qumran was active, when the Temple Scroll was suspected to be written, all in comparison to the other Qumran documents.
The first problem I ran into was, the more specific I was in the search box, the less the "default" content would populate the timeline. I know this is the expected behavior.
The second problem I ran into was I would loose were the Temple Scroll was on the timeline because everything is similar in color/size and my eyes were not directed quickly to see the essential relationship information. Now I know "essential relationship information" is very subjective in this type of use of the timeline but I would guess that people use the timeline in a similar way and is possibly normative.
To overcome the subjectivity to some degree, you could have all the "default" events that populate the timeline, (because of the specified time range in the left hand box), would populate the timeline with the default color scheme already used.
Specific items that are typed into the right hand search box would have a dynamically/custom colored scheme that is more visually striking in relation to the "default" populated events.
e.g., all the events that occur between 316BCE - 250CE would populate the timeline with the default color scheme and be controlled by the drop-down menu check boxes(i.e., "on" or "off") but any "item/key word" used in the search box (i.e., Qumran, "Temple Scroll", 1QpHab) on the right would have a custom/dynamic color scheme that would be more visually discerned.
I hope that makes sense. [:D]
...and perhaps someday you could even develop a more mixed info-graphic timeline.
