Fokke op sokken

The wordplay in 'Fox in Socks' is so inventive and fun. I wonder what inspired him to create these playful phrases that have stuck with so many readers.

Some of the tongue-twisters had me stumbling, but they also made me laugh. Are there any tricks to mastering these phrases without getting tongue-tied?

His silly characters and playful language seem to appeal across generations. Why do you think his humor still resonates today?