Meaning: The tower is being constructed gradually and at a leisurely pace, allowing for careful stacking of the blocks.
Choice of Words: The sentence describes the process of building a tall tower using blocks. The word "blocks" is a noun that refers to small, solid objects that can be stacked together, and the word "tower" is a noun that refers to a tall, narrow structure. The word "slowly" is an adverb that describes the pace at which the tower is being built.