In the video, a man is seen holding a piece of rock and placing it inside a terrarium. The rock is brown and has a rough texture. The man carefully positions the rock inside the terrarium, ensuring it is secure and stable. He then points to the rock, possibly indicating its placement or significance. The terrarium appears to be a controlled environment for housing reptiles or other small animals. The man's actions suggest he is setting up the terrarium for a specific purpose, such as creating a habitat for a pet or conducting a scientific experiment.