iBooks Author: objects
Objects are items you add to your book, such as images, shapes, widgets, tables, and so on. There are three kinds of objects:
Inline objects are embedded in text and move with the text.
Floating objects stay in a fixed position (wherever you place them) on the page.
Anchored objects stay in a specified place on a page, and are anchored to specific text. When text flow moves the anchor () to another page, the object appears in the same position on the new page.
You can change objects from one kind to another using the format bar or the Wrap inspector: