Kamiza is often explained as “the seat farthest from the entrance.” That is a useful basic rule, but real rooms are not always that simple. Some have two doors, and in others it may not be obvious which doorway should count as the main entrance. In those cases, distance alone is not enough.
The first thing to look at is which entrance is actually used in practice. If a room has two doors but one is rarely used, it makes more sense to treat the regularly used doorway as the entrance. If there is no obvious entrance at all, look at other clues such as the tokonoma, the furniture arrangement, and the way the room is normally used.
In a traditional Japanese room, the tokonoma, or decorative alcove, is especially important. A seat near the tokonoma is generally treated as the kamiza, even when the entrance alone would suggest a different arrangement. In a Western-style room, the seat farthest from the entrance is still the basic guide, but the type and arrangement of sofas and chairs can also matter. A seat with the best view is not automatically the kamiza.
In other words, kamiza is not something you determine mechanically from a floor plan. You consider the entrance, the tokonoma, the furniture, and how people actually move through the room.
Even then, some rooms are genuinely difficult to judge. There is no need to force yourself to guess. At a restaurant or event venue, arriving a little early and asking the staff, “Which is the seat of honor?” is often the safest option. If the host shows you where to sit, simply follow their guidance.
If a guest chooses a seat without waiting and ends up taking the kamiza, it can look rude. But the first impression may be less “This person is deliberately being disrespectful” and more “This person probably does not know the rules of kamiza and shimoza.”
Kamiza is not a test where you are supposed to discover the one hidden correct seat in the room. It is a way of deciding where to seat someone in order to show them the greatest respect. Know the basic rule, look at how the room is actually used, and if it is still unclear, ask. That is enough.
