Which linguistic device was deliberately employed in Apple's famous 'Think Different' slogan that made it particularly memorable and controversial among language purists?

Advertising slogans are among the most linguistically influential pieces of corporate communication. They often employ powerful rhetorical devices, become part of everyday speech, and can even influence language evolution. This trivia explores how linguistic principles have been leveraged in creating some of the world's most memorable advertising phrases that have transcended marketing to become cultural touchstones.

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Grammatical incorrectness (using an adjective 'different' where an adverb 'differently' would be grammatically correct)
Rhyming couplet (the hidden rhyme between 'think' and 'ink')
Neologism (the creation of the compound word 'thinkdifferent' as a new concept)
Palindromic structure (the phrase reads the same backward when viewing the letter patterns)