Interaction Totem, S.K. Webster

Interaction Totem

High fire Stoneware, Feldspar, clay and ash glazes 

The three small pots at the base of the totem represent the main effects of the three main ingredients in glazes.  A main effect is when each is used alone.  They are from left to right:  feldspar, ashes, and clay.  The four pots in the totem represent all of their possible interactions:  Ashes + clay; Ashes + Feldspar; Clay + Feldspar and Clay+Feldspar+ Ashes.  Potters use empirical methods in glaze formulations.   The designs are similar to those used in experimental psychology.  This is a 2 X  2 X X 2 between pots design. 

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Click here for a description of factorial designs from Bill Trochim's Center for Research Methods