Warning: Use of undefined constant user_level - assumed 'user_level' (this will throw an Error in a future version of PHP) in /home/rhapsodia/www/weblog/wp-content/plugins/ultimate-google-analytics/ultimate_ga.php on line 524

『愛の空間』（井上章一, 2015.10.24）を読んで，まとめを書きました．