Question: I used to fill rooms but now I'm a tower,
I can stay put or I can travel far.
What am I?
Hint: I can live on a sill,
I can be a tasty fruit.
If I get injured,
I'll need a good boot.
Answer: A computer. They used to be huge and desktops are now referred to as towers. They can be desktops (stay put) or laptops (travel far). The computer can run windows (sill) or it can be an Apple computer (fruit).
Question: My thickness is no more than a few centimeters, yet my depth can span to infinity. Although mundane, I intimidate most animals. When in my presence, you will inevitably follow me. What am I?
Answer: I'm a mirror.