fill your terminal with colored pipes/tubes

pipes

#!/bin/bash -e
declare -i  f=75 s=13 r=5000 t=0 c=1 n=0 l=0
declare -i  x=$((w/2)) y=$((h/2))
declare -ar v=( [00]="\x83" [01]="\x8f" [03]="\x93"
                [10]="\x9b" [11]="\x81" [12]="\x93"
                [21]="\x97" [22]="\x83" [23]="\x9b"
                [30]="\x97" [32]="\x8f" [33]="\x81"
            )

trap "clear; tput rmcup; tput cnorm" EXIT
tput smcup; tput reset; tput civis

while ! read -t0.0$((1000/$f)) -n1; do
    # update boundaries
    declare -i w=$(tput cols) h=$(tput lines)

    # set new position:
    (($l%2)) && ((x+=($l==1)?1:-1)) || ((y+=($l==2)?1:-1))

    # loop on edges (change color on loop)
    ((c=($x>$w || $x<0 || $y>$h || $y<0)?($RANDOM%7-1):$c))
    ((x=($x>$w)?0:(($x<0)?$w:$x)))
    ((y=($y>$h)?0:(($y<0)?$h:$y)))

    # new random direction
    ((n=$RANDOM%$s-1))
    ((n=($n>1||$n==0)?$l:$l+$n))
    ((n=($n<0)?3:$n%4))

    # print or clear
    tput cup $y $x
    echo -ne "\033[1;3${c}m\xe2\x94${v[$l$n]}"
    (($t>$r)) && { tput reset; tput civis; t=0; } || ((t++))
    l=$n
done

original found here
small changes applied

Wait, why did you set -e? It is not working with it (or i'm missing something).

I was testing, -e will exit when an error occures. it works the way it is now, needs some work though. the trap doesn't always run (^C may break this). also I've removed the arguments parsing for now.
mostly playing around :) this should also work when resizing the terminal