Bass hammer weights on pianos

I remarked a while back that I never noticed that the keys become heavier as one heads downward on the keyboard on a piano. I know that people had said that they do, and I sort of had to take their word for it since, having played since I was a kid, I was too used to them to be able to judge.

However, having spent the past two days on the organ, sitting down to the piano was a revelation.

Yes. The keys are heavier at the bass end of things. Are they ever.

So that was a surprise.