Whose ideas were excessively vague;"
— We meet this old man in one of Edward Lear's limericks:
"He built a balloon,
To examine the moon,
That deluded Old Man of the Hague.
— It's Lear's birthday today. Let's celebrate it (and any other birthday, of course) with, well, balloons:
›› Let the balloons bounce and the music play for a joyful birthday. (Outlook, Outlook Express)