authors 
Earl, Chris F. 
year 
2001 
title 
Symmetry and Equality of Shapes 
source 
J. S. Gero, B. Tversky and T. Purcell (eds), 2001, Visual and Spatial Reasoning in Design, II  Key Centre of Design Computing and Cognition, University of Sydney, Australia 
summary 
Shapes are equal if the spatial relations between their parts areequal. But spatial relations are equal if shapes characterizing the relationare equal. This recursive nature of shape and shape relations isexamined. A repeated shape has distinct parts each equal and in one of aspecified set of spatial relations to another part. A symmetrical shapehas the same spatial relation to each part of some repeated shape.Repeated shapes are simple examples of generated shapes but can showintricate behaviour and indicate the problems of predicting spatialproperties in generative shapes. 
series 
other 
email 
cfearl71@yahoo.co.uk 
more 
http://www.arch.usyd.edu.au/kcdc/conferences/vr01/ 
full text 
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last changed 
2003/05/02 09:11 
