I also brew upside down, and I do get foam. But this is the same type of foam that you get with a french press. I think the difference is that this foam is caus

I also brew upside down, and I do get foam. But this is the same type of foam that you get with a french press. I think the difference is that this foam is caused by heat, while a good crema is caused by the pressure. It certainly tastes and looks different.