Which language learning app's 2019 "Think in a new language" campaign featured a groundbreaking billboard that analyzed and responded to spoken language in real-time?

In the world of language learning apps, branding and product design are crucial for market differentiation. This poll tests your knowledge about a revolutionary advertising campaign that transformed how language learning is perceived in the digital marketplace. The campaign in question utilized unique linguistic psychology principles and redefined user engagement in educational technology.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Duolingo's interactive owl billboards
Babbel's neural-response advertisements
Rosetta Stone's immersive projection mapping
Memrise's multilingual voice recognition posters