#3 Sometimes Apple builds entirely new physical barriers for projects

"Apple employees know something big is afoot when the carpenters appear in their office building," according to the book "Inside Apple."

"New walls are quickly erected. Doors are added and new security protocols put into place. Windows that once were transparent are now frosted. Other rooms have no windows at all. They are called lockdown rooms: No information goes in or out without a reason."

#2 Apple also has a pretty intense tracking system for its products                        

From an anonymous Apple employee on Quora:

"All prototypes are laser marked with serial numbers and tracked by a central tracking system (called iTrack). Physical security is also highly prioritized, with prototypes required to be locked up when not in use. Access to prototypes is also restricted, and the default assumption within the company is that your coworkers do not know what you’re working on.

Physical access to the areas of certain groups (product design, industrial design, and reliability) is highly restricted by badge access. The most sensitive areas, such as the Industrial Design Studio, have receptionists, external cameras to screen guests, and require an escort to vouch for you. Within these areas and groups, knowledge of the product pipeline and access to prototypes is widespread, but that knowledge doesn’t leave the group."

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