ABSTRACT
Analogies of practice involve people in looking closer at practices of distinctive domains of expertise, therein to find ways in which those practices inform and give insight into each other. This chapter considers the emergence of two related themes. One concerns the difference between the analytic practices of chemistry and those of physics; the other, the differentiation between parametric and indicial models. More computer approaches match linear approximations of edge curves and compare pictorial features of the pieces, the latter rendered in terms of color and intensity of pixelated images at some specified depth along the edges. Independently of whether these computer-based techniques will lead to the solution of jigsaws puzzles, they seem to reveal little about the ways humans put the puzzles together. Solving Rush Hour puzzles involves the perception of shapes fitting together, sequences of moves working with each other, immediate history of attempting to shift the cars, failures that result, and new possibilities that are envisioned.
