The night sky was a vast, twinkling canvas.
Meaning: This means that the night sky looked very big and beautiful with all the stars shining like tiny lights.
Choice of Words: Vast means very large in size or amount. Twinkling is a verb that means to shine with a flickering light. Canvas is a noun that means a piece of strong cloth used for painting on. When you put them together, "The night sky was a vast, twinkling canvas" means that the sky at night was very large and had many stars that were shining with a flickering light.
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