David W. Brown, writing for The Atlantic back in 2011:
When engineers working on the very first iPod completed the
prototype, they presented their work to Steve Jobs for his
approval. Jobs played with the device, scrutinized it, weighed it
in his hands, and promptly rejected it. It was too big.
The engineers explained that they had to reinvent inventing to
create the iPod, and that it was simply impossible to make it any
smaller. Jobs was quiet for a moment. Finally he stood, walked
over to an aquarium, and dropped the iPod in the tank. After it
touched bottom, bubbles floated to the top.
“Those are air bubbles,” he snapped. “That means there’s space in
there. Make it smaller.”
How common is it for these rooms at Apple to have aquariums in them? That sounds fishy to me.