[nutjob2]

> After all, the TSMC logo features failing parts!

I'm not sure about that, I think the blank spaces are just parts that have been picked. The dies have been cut and the good ones are being removed.

[prezk]

Normally a wafer would have die-sized spaces for test structures used for optical, electrical, chemical and other tests. Think the TV test card https://en.wikipedia.org/wiki/Test_card