For example, a pull up works the vertical
plane from top to bottom (overhead), a bent over row or body row works the
horizontal plane, and a high pull works the vertical
plane from bottom to top (from arms
extended below the waist to the chin).
To, thankfully, some of the very interesting explorations in collage, 3 - D printed art, like Ashley Zelinskie's reverse abstractions (see the photograph of her table - top sculpture below) and paintings that
extended from the vertical walls into the
horizontal planes of the floor.