Essential, all individuals abstract a different reality. For example, one individual who walks into a building abstracts the reality they are prepared to abstract. The signals that interest them are organized by patterns within their brain whereas another individual abstracts a different reality.
All individuals have their own reality. Within those realities are things selected of interest and all other signals are ignored. The brain receives billions of signals all the time and it will pick out the signals that fit into the established grooves for the brain that has been laid down by past experiences.
Signals that are an interest to the brain get accepted and the signals that do not will get ignored.
7 billion individuals on the Earth, 7 billion different realities.