In a large house, Elara, Tobias, and Saskia are gathering for a book club discussion. Elara, the host, has left the current book they are discussing on the kitchen counter. She then goes upstairs to get something, forgetting to inform Tobias and Saskia about the book's location. Tobias has been in the house before and knows that Elara often leaves items on the kitchen counter. Saskia has never visited before and is waiting in the living room. Tobias enters the kitchen to get a glass of water, sees the book, and leaves it there. When Elara comes downstairs, she asks Tobias if he knows where the book is. He says that it is on the kitchen counter. Saskia overhears this and asks, "How did you know where the book was?" Given this situation, does Tobias know where Elara usually leaves items, and how does Saskia come to understand that Tobias knew the location of the book without seeing Elara put it there?
Provide a short response.
Tobias knows where Elara usually leaves items because this pattern has been established from his previous visits to the house. As a recurring guest familiar with Elara's habits, he understands her tendency to place things on the kitchen counter. Therefore, when asked about the book, he confidently indicates its location despite Elara not telling him directly during this visit. 

Saskia learns about Tobias's knowledge of the book's location from the exchange she overhears between Elara and Tobias. When Elara asks Tobias if he knows where the book is, his quick response suggests that he has prior knowledge of Elara's behavior concerning where she leaves things. Since Saskia is unaware of Tobias's previous visits and Elara's habits, she infers from the conversation that Tobias must have seen the book in the kitchen or deduced its location based on his past experiences in Elara's house. Saskia's conclusion about Tobias's knowledge is a demonstration of Theory of Mind, as Saskia is attributing to Tobias the capability of knowing something based on his past experiences without needing to witness the specific action (Elara putting the book on the counter) this time around.