听力原文： Our company's offices are filled with models and gadgets that employees have built to test their ideas. We encourage this kind of creativity. We believe the best way for an engineer to test an idea is to build it. If one can get a prototype of the product to work, one can usually figure out how to scale it up and this in turn helps one to anticipate any problems one might have. We also believe fixed meetings are a waste of time. We're engineers, so if we have ideas, we need to build them and test them. Building working models feeds our creativity, which in turn fuels innovation. It also gives the client a clear example of what the final product will look like.
According to the speaker, what special items could be found in their office？

A. Prototypes
B. Games
C. Paintings
D. Printed plans