You've no doubt witnessed a child playing with the box a toy came in rather than with the toy. It happens all the time. Just my opinion, but it could be that "toys" are created in the mind of an adult who thinks they know what a child wants. I think that children want to be curious. They don't need toys that do everything for them; they need toys that encourage them to do something with them. Boxes fall neatly into that category.
Younger children, i.e., babies, are the same way. They may not be able to drag a box around or make a play house out of it, but they can certainly keep themselves "entertained" with it.
As a rule, the simpler the toy, the better, because babies can use their imaginations to create their own expressions of the world they live in. Why try to superimpose an adult's idea of the baby's world?
Home made toys can reflect the simplicity that babies need and want, so before running off to the store to buy the latest baby gadget toy, take a look around your home and see what your baby might want to play with. Keep safety in mind, of course. No sharp edges or objects too heavy and no small parts or small parts that might come off during play.
If you want some ideas to get started, check out Baby Toys You Can Make. If you want a bright, happy and satisfied baby, let his/her imagination loose!
Image courtesy of Rachel Veretto