I liked the way Arika Okrent organized the artificial languages into trends and put them in philosophical context of the time. The sheer volume of the information may, however, be a little offputting at times, and of course I didn't actually
read the list of 500 languages she gives at the end.
I suppose this book has somewhat spoiled Eco's [b:The Search for the Perfect Language|10513|The Search for the Perfect Language|Umberto Eco|https://images.gr-assets.com/books/1166253886s/10513.jpg|1921737] for me, I'll just have to put that one off.