object
The object property allows you to select an object, and then optionally use *{} expressions for access to fields and methods of object inside the element. This is allow keep code cleaner.
<div th:object="${session.user}">
<p>Name: <span th:text="*{firstName}">Harry</span>.</p>
<p>Surname: <span th:text="*{lastName}">Potter</span>.</p>
<!-- for some reason, coder want use ${} expression -->
<p>Nationality: <span th:text="${session.user.nationality}">You yourself know.</span>.</p>
</div>