a design with strong 'horizontals' [=horizontal lines or parts]
The line extends 'horizontally'.
a 'horizontal' line/beam
(..) You better hang back. - Is this thing loaded? - Yeah, go for it. Rain bands. Look at the surf. Shit, horizontal rain! Hang on! Jesus, I've never seen clutter like this. I don't think anyone has. Flash frequencies are high. We're in the core. (..)1996 Twister