When inside it is inky dark and outside there is bright light, and if there happens to be a small chink in the obscuring darkness through which some light can enter, well then life gets a bit interesting. The image of what is outside will filter into the room, but in an inverted fashion. Up will be down and down will be up. You will see a tree on your wall, but an upside down one. That is the facts of what is often known as the Camera Obscura.
A brilliant artist using this method Abelardo Morell  uses this technique to blend upside-down outdoor panoramic scenes on right-side-up indoor ones for images that are both haunting and mystifying as you try to tease apart what belongs where. He also rights the images, as do our modern day camera, to give you right-side panoramas in some of his photos.
In the Talmud (Bava Basra) there is the story of Rabbi Yehoshua’s son who had what we might call a near-death experience. He was sick, his soul left his body, and then he was revived. Upon his revival, his father wanted to know what he saw during his out-of-body experience. And the patient said, “Olam Hafuch Ra’eesee – an upside down world I saw.” ‘Those who sit at the dais here in this world are relegated to back seats there. Those who are downtrodden here are placed up front there. Up is down and down is up.’ To which Rabbi Yehushua responded, ‘you saw with clarity, ‘tis true.’
A person living in a dark room with very little light coming in will think all of the world is upside down. That person, on emerging from the dark room, will be flabbergasted to find the actual objects that cast the image are stationed right-side-up on the outside. We, living here in Olam Hazeh, in the temporal world, are sitting in a dark world, where spirituality comes sneaking in through chinks in the physicality. Therefore, all we see is inverted panoramas (unless we have outfitted ourselves with special lenses to right-side-up the images). In the next world, where all is light and spirituality, that is where the right-side up actuality is found. That is why in this world we often value aggrandizing pontificators and shun the plain G-d fearing simpleton. Upside down views we have, until we will be surprised to find out that in realms of light, those who we shun here might be the kings there. After all, isn’t that the story of King David, the upright man, not valued in his generation, but beloved by G-d?
 see the upside down one at
To read another explanation of the upside world, read Rabbi Ciner here: