From our home planet Earth, when we look toward Mars, we see many different kinds of doors drifting among the clouds. Each door leads to a different place: some to joyful places, some to sorrowful ones, and some to blocked paths that stay closed even after opening. These cloud-bound doors feel like they go beyond the ordinary doors we know. If you had the chance to open one of these floating doors, what kind of place would you imagine discovering behind it?