Changes

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* turtle: specify which turtle is active
 
* turtle: specify which turtle is active
 
* turtle shell: import a image from the Journal to use as the turtle's 'shell', i.e., replace the turtle with a sprite.
 
* turtle shell: import a image from the Journal to use as the turtle's 'shell', i.e., replace the turtle with a sprite.
* top of stack: block to denote the top of a collapsible stack
+
* sandwich clamp: "clamp" a stack of blocks to hide
* bottom of stack: block to denote the bottom of a collapsible stack
  −
:: To use the collapsible-stack blocks, place them around the blocks you want to hide
      
====Portfolio Palette====
 
====Portfolio Palette====