As you check the various mirrors, you find that each one does at least have a convenient leaflet attached with a name and explanation of the dimension for the mirror. One in particular caught your eye.
"Interested in an untamed world where beasts, both mundane and mythical exist? Then NATURE ONE's mirror is for you!"
"Encounter horses in Plains. Dinosaurs in jungle biomes. Behemoths in the deep oceans. Even creatures that make their homes in sky biomes!"
"Whether as something as common as a deer or mythical as a fantasy Tarrasque, Nature One's mirror has a beast for you!"
Already finding it to your interest. You tentatively touch the mirror, still having reservations of this situation being real or not. Not being solid, but semi-solid, you steel your mind and push through.
You find yourself in a large grassy clearing and by a large body of water. Not sure of how large it is, as you've had enough geography knowledge to know sometimes you can't see past the horizon for lakes. For the rest of there area, you could see what would count for various biomes. Although they all seemed so far away, they were close enough you could easily make out their details. Forests, mountains, jungles, deserts, and so on. You weren't sure how exactly large this world was, but this starting area seemed to at least be convenient to choose where you want to go and explore. Within distance, you at least saw some common animals you've seen in shows, books, or in person. While some were not so common and possibly even fictional, but all seemed content to keep their distance from you.
Of course there was the mirror itself. Still there and also with its own leaflet.
"Please enjoy your stay in this mirror's dimension, but feel free to leave at any moment as well! All creatures will keep their distance from this area and no alterations can be made to the nearby landscape. This dimension also comes with an informational guide should you choose to use it. Just "think" of it and it will appear to you.!"
With all this information in mind, you decide to just kind of observe and take things in at your own leisure. Before you know it, the first hour has past and something begins to happen...