Timeline based and "rich" design applications benefit from a dual monitor set-up and are common in most professional design environments. Palettes and timelines are often pushed to the secondary monitor allowing the "stage" to occupy the majority of the primary monitor real estate. The primary monitor is generally parallel to direct, straight ahead focus. The interaction of moving to the secondary monitor for tool selection, key framing etc... is not inherently bad when compared to the confines of a single monitor, but breaks a sense of cohesion between the stage and editing tools.

Enter the Vertical Monitor.

We are used to a 4:3 or 16:9 aspect ratio in cinema, television and with computer monitors. The vertical based monitor would be approximately 4:6, or 1024 x 1536. Although unconventional, this allows the user to engage the stage with lessened head/eye movement and be more efficient with the focus of their work. Examples that may benefit include: AfterEffects, Final Cut Pro, Flash, and Director.