How can I stack windows using curses?

Question

I am using curses on Linux (arch, zsh with tmux) and trying to stack two or more windows next to one another.
Here is my basic code:

def main(screen):
    # render_all_elements(screen)
    window1 = curses.newwin(100, 100, 0, 0)
    window1.border()
    window1.refresh()
    window2 = curses.newwin(10, 10, 100, 100)
    window2.border()
    window2.refresh()
    screen.getch()
    curses.nocbreak()  # Turn off cbreak mode
    curses.echo()  # Turn echo back on
    curses.curs_set(1)  # Turn cursor back on


if __name__ == "__main__":
    curses.wrapper(main)

It doesn't show either of the screens, am I missing something obvious?