These subtle alterations can make a huge difference. They can have a profound effect.

This has made a huge difference, but it hasn't spoilt anything.

There's a very subtle effect, a spike, and that's what we're looking for.

I don't want to call it only cosmetic, because these things do have an effect, but how profound the effect is, that I would question. Much of this is not about policy, it's about motion. It shows that they are responding; that they are moving.

Rehearsals make a huge difference.

There is a profound difference between information and meaning.