globals [buttons]           ; Global variables

to setup                    ; Initializes model for new run.
    set-default-shape turtles "circle" ; Turtles are circles
    clear-all                          ; Reset turtles and patches
    set buttons 500                    ; Set number of buttons to 500
    create-turtles (buttons)           ; Create "buttons" number of turtles
    ask turtles [setup-turtles]        ; Initialize each turtle
end

to setup-turtles            ; Called for each turtle during setup
    setxy random screen-size-x random screen-size-y ; Set our x,y randomly
end