Changes

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* bottom of stack: block to denote the bottom of a collapsible stack
 
* 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
 
:: To use the collapsible-stack blocks, place them around the blocks you want to hide
 +
* read pixel: push the RGB value of the pixel under the turtle onto the FILO (blue is first, red is last)
 +
* turtle sees: the "palette color" of the pixel under the turtle
    
====Portfolio Palette====
 
====Portfolio Palette====