Final answer:
The literary device used in the given phrase is Personification, attributing human qualities to abstract concepts. The literary device used in the phrase 'The intense vitality that had been so remarkable in the garage was converted into impressive hauteur' is personification. Personification is when human characteristics are attributed to something non-human.
Step-by-step explanation:
The literary device used in the phrase "The intense vitality that had been so remarkable in the garage was converted into impressive hauteur" is Personification. Personification is a figurative language technique where human qualities are given to objects, animals, or ideas. This device is being used in the phrase as 'vitality' and 'hauteur', which are abstractions, are given human-like capabilities, such as being remarkable or being converted, which suggests a form of human activity or characteristic.