Veni, Vidi, VISA

function most_useless_use_of_zsh {

integer colours

if (( $# )); then

  colours=$1

else

  colours=$(echotc Co) || return 1

fi

local lines columns colour a b p q i pnew

((columns=COLUMNS-1, lines=LINES-1, colour=0))

for ((b=-1.5; b<=1.5; b+=3.0/lines)) do

    for ((a=-2.0; a<=1; a+=3.0/columns)) do

      for ((p=0.0, q=0.0, i=0; p*p+q*q < 4 && i < colours*4; i++)) do

            ((pnew=p*p-q*q+a, q=2*p*q+b, p=pnew))

        done

        ((colour=(i/4)%colours))

        print -nP "%${colour}K %k"

    done

    echo

done

}