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Upon tapping the Math course icon, the app transitions to a dark loading screen. The screen features a delightful, looping animation of Duo, the Duolingo mascot, peeking out from behind a giant 3D-style ruler. Duo slides out to the right, wiggles with playful energy, blinks, and then ducks back behind the ruler. This charming micro-interaction entertains the user during the loading process, reinforcing the brand's friendly and gamified identity.
