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Message: <blockquote data-quote="Caliban" data-source="post: 6856669" data-attributes="member: 284">Other than connecting to all the mortal planes, and then to the upper and lower planes in various ways, I don't see how they are all alike.   The bright and spartan Plane of Mirrors, constructed out of reflections of the mortal worlds with mirrors;  the dark and gloomy Plane of Shadows that connects to all the shadowy places; the Astral plane where physical matter is accelerated to the point where teleportation spells use it to achieve instantaneous travel and those who astral project into it can create materal bodies in other planes via the Color Pools.  The Ethereal Plane,  where ghosts and other incorporeal creatures dwell, a plane that you can observe without traveling there by using See Invisibility.  The interstitial planes are the connective tissue of the multiverse.  Does your body need only a single type of connective tissue?  They keep the other planes separated, yet allow travel between them using a variety of different methods.  Aside from all that,  each of these planes existed in previous editions of D&D and are potential sources of plot points and interesting places for the PC's to explore .  I don't see any reason to limit myself to just one. Why do we need multiple ways of traveling through our own world?  I mean, we have walking, riding, cars, boats, trains, airplanes.  Not to mention rivers, tunnels, cave systems, oceans, and roads.    Basically, it allows for a "realistic" amount of fantastic travel methods in a fantasy settings.    And as for conceptualizing how a plane can connect to all other planes...it's magic.  Or N-dimensional mathematics.  Take your pick.    There are quite literally, an infinite number of inhabitable worlds in this cosmology, existing in an infinite number of mortal realms of various sizes.  Some of the mortal realms only hold a single planet (or even a single element - such as an Elemental Plane of Air), while others contain billions of galaxies. If there are people living on the moon, or even a nearby planet, then yes, it would be possible to see signs of them if you have the means of doing so via technology (telescopes) or magic (clairvoyance, auguries, etc.).    Whether or not there are any inhabited planets near enough to see is up to the DM and the particular realm the campaign is set in.  This is a cosmology - it comprises billions of universes in a single multiverse.  Some of those universes are exactly like ours (well, ours with the added possibility of being visited by dimension hopping D&D adventurers).     Not sure I understand your question.   They work exactly as I described them.    You can travel between various planes, or even various points on the same plane, using the interstitial planes.   So you could use the Astral plane to travel to the High Heavens,  to another mortal realm, or to another location on the same planet or to a different planet in the same realm (if the realm is one with multiple planets and/or stars). Usually you don't travel to another planet in the same realm on accident.   It's a long way, and generally it's much easier to use a well known path to nearby location or a nearby plane.  Why would it be easier to travel to another plane of existence than to another planet in the same universe?  Because this is a fantasy setting.  <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f61b.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":p" title="Stick out tongue    :p"  data-smilie="7"data-shortname=":p" /></blockquote>

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