"Die Schönheit einer Sternfigur – eines SechseckSterns etwa – wird beeinträchtigt, wenn man sie symmetrisch bezüglich einer bestimmten Achse sieht."
Ludwig Wittgenstein, 1948. (Vermischte Bemerkungen, p. 135.)
Gestalt perception and its formalization



Wertheimer's thesis: Gestalt perception is determined by several interacting principles, such as: Proximity: O OO OOO OOO OOOOOO OO 
Proximity 
Continuation 
Similarity 
Closure 

ReferencesMax Wertheimer: "Untersuchungen zur Lehre von
der Gestalt." Psychologische Forschung 4 (1923),
pp. 301350. [English translation of important parts of this paper: "Laws
of Organization in Perceptual Forms." In: W. Ellis: A
source book of Gestalt psychology. London: Routledge & Kegan Paul,
1938, pp. 7188.] 




Jos de Bruin's online SITInterpreter applet allows you to play with SITcodes for discrete lines. [Note that this applet uses the SITnotation defined in Chapter 2 of Dastani (1998), which is different than the one used in the examples above. Use the button "Auto" to see random examples of codes in that notation.] 

Mapping arbitrary inputcodes onto their shortest
equivalent SITnotation is an NPcomplete problem. (The computational
complexity is caused by the alternationoperation.) There are two
implemented algrithms that try to meet this challenge. 

Dastani (1998) discusses some fundamental limitations of Structural Information Theory, and tries to overcome some of them. The most important limitations are:


Remko Scha & Jos de Bruin, 2002