The attached shell script turns off cursor visibility (terminfo's "civis")
, sequence ESC [?25l

However, the subsequent escape sequences printed by the example script will
result in the cursor reappearing after the word "seen:".  The shell script
does not explicitly change cursor visibility, though.

This behavior is exhibited only in gnome-terminal, and it screws up a lot
of ncurses applications.

Neither xterm, nor rxvt, exhibit this behavior (the cursor remains in
invisible state throughout the entire demonstration).