er.mit.edu/books/content/sectbyfn/books_pres_0/6515/sicp.zip/full-text/book/book-Z-H-24.html#%25_sec_3.5.5" title="SICP Section 3.5.5">(Section&nbsp;3.5.5)</a></p>
<p>The object model approximates the world by dividing it into separate pieces. The functional model does not modularize along object boundaries. The object model is useful when the unshared state of the “objects” is much larger than the state that they share. An example of a place where the object viewpoint fails is quantum mechanics, where 