What are some things that I could gift a curious toddler?

Toddlers are at an age where they are very curious and are learning by observing and playing with things around them. Some toys that you could gift a curious toddler are:
* Building blocks
* Picture books
* Simple puzzles
* A scooter
* Toys that play nursery rhymes
* Balls of different sizes
* Bubble gun
... and many more.