anchor.diff:  the show variable was stored) or <<oscillated-parameters,oscillated
   parameters>>.
   
  -## Spatial Parameters
  +== Spatial Parameters
   
   Spatial parameters allow you to base an effect parameter on the physical
   arrangement or relationships between fixtures in your light show. The
  
positive.code: the show variable was stored) or <<oscillated-parameters,oscillated
  parameters>>.
  
  ## Pan Tilt Parameters
  
  A more traditional way of aiming fixtures (in contrast to
  <<parameters#direction-parameters,Direction Parameters>>) involves
  
negative.code: parameters, as shown in the
  <<effects#spatial-effects,effect examples>>.
  
  == Digging Deeper
  
  For more details, see the
  http://deepsymmetry.org/afterglow/doc/afterglow.effects.params.html[API
  