It was touted as the first true cure for jetlag: a machine that put you into stasis for up to 24 hours. You stepped into it after landing, and it paused you for whatever length of time was needed to resynchronize your body clock with local time.
No one travels any more, of course, but I still use mine twice a year. I pop my kids and pets in there each spring and autumn so that they don’t wake me at oh-god-o’clock after the clocks change for daylight saving.
Thanks to @oysta for the inspiration.