bash Conway glider spinner

conwaySpinner.sh

#!/bin/bash
frames=("⠢⠇" "⠨⠖" "⠬⠆" "⠐⡴"  "⠢⠇" "⠨⠖" "⠬⠆" ".." "⣤ ")
nFrames=${#frames[@]}
curFrame=0
frameTime=0.2
printf "  "
while true; do
    printf "\033[2D${frames[$curFrame]}"
    curFrame=$[$curFrame+1]
    if [ $curFrame -ge $nFrames ]; then
        curFrame=0
    fi
    sleep $frameTime
done