CS838 Vis Week2_1

- Reading Tufte and Munzner together
 Tufte: 
   - lot more "opinionated"
   - tells in historical order (development of visualisation)
      -> lot of the now obvious things are recent inventions! (e.g. time-series)

(     ) is it good?
Why / What / How / When 

- Why choose vis?
  - Alternatives to vis: tables, algorithm, textual narratives, memory... 
  - psychology :   - 	perceptual 
	          -	cognitive -> motivations ->  specific design -> building blocks
  - Arrows: compresses time and puts it into space

    Tufte piece: history -> specific designs       
    Munzner piece: building block -(process)-> designs -> strategies -> examples

  - Tufte's emphasis on multivariate: for efficiency, to see complicate relationships of causality (correlations)
    - Tufte is on the 'presenter' side of the explorer-presenter spectrum 
       precision: unambigous, everyone gets the same message (vs 'accuracy' as 'right message')
       clarity (vs reliability, variablilty)
       efficiency
        -> not about getting ALL data up (signal to noise)

	projection
Data 	------------->	derived values
    multivariate		x.y. 

Values		----->	Visual encodings
			position(s)
			color / brightness / orintation / shape / size...
			(which is good for what? : perception)

  * dataflow moves intuitionally (e.g. left to right)