http://languagelog.ldc.upenn.edu/nll/?p=1701# More mysterious is the entry for a book called The Mosaic Navigator: The essential guide to the Internet Interface, which is dated 1939 and attributed to Sigmund Freud and Katherine Jones. My guess is that this is connected to Jones' having been the translator of Freud's Moses and Monotheism, which must have somehow triggered the other sense of the word mosaic, though the details of the process leave me baffled.
Cмешная, но очень содержательная статья и и не менее содержательное обсуждение.