The linear exhibit is the simplest configuration for a custom exhibit. It's usually 10' deep, has a full backwall to separate it from neighboring exhibitors behind it, and frequently along the sides as well.
This is the most restrictive configuration in terms of show rules governing height, setbacks from the front aisle, and the available space itself. The other drawback to a linear is the single chance visitors have to see you. If they miss the aisle you're on, you've lost them altogether.
Still, linears are intimate, easy to control, and you'll never hear a visitor complaining about getting lost in one.