How does Michael Ende use imagery in The Neverending Story?

Example of Imagery:

"And so it was with Bastian and Atreyu, who were sitting side by side on the broad balcony of Querquobad's palace. Neither had ever heard the song of a luckdragon before. Hand in hand, they listened in silent delight. Each knew that the other shared his feeling, a feeling of joy at having found a friend. And they took care not to spoil it with idle words."