Bad eggs to good eggs
The many folds in a chef's hat symbolize the 100 ways a chef can prepare an egg.
To learn to prepare an egg properly you'll have to cook a lot of bad eggs. I ruined many eggs to make consistently good ones.
Eggs are delicate. To fry a sunny side-up egg, first you need to learn to crack it. To crack an egg, tap the broad end-side of the shell against a flat surface with just enough force to crack it and not the yolk.
Then you fry it. You'll experiment cooking it in a skillet with a small amount of fat, medium heat, different seasonings, the appropriate utensil and the timing of it all.
That's just one egg prepared one way. A successful sketch shares the same sentiment.
100 blank pages in a sketchbook represents the many ways an Industrial Designer can develop an idea. And a lot of bad drawings and ideas are bound to happen first.