[andybak]

Actually masonry was I was thinking of. Where do this waterfall business come from then?

[Deukhoofd]

Same thing, different name. It's kind of like a waterfall in that it's a continuous vertical layout.

[aldousd666]

I was equally confused by this. I tried everywhere to find what the heck that even meant in this context and discovered that it is apparently a term they invented themselves.