Is the monitor height a rule, or a guide? I spend most of my time in a Linux terminal, where the command I type appears at the bottom of the screen. I figure

Is the monitor height a rule, or a guide? I spend most of my time in a Linux terminal, where the command I type appears at the bottom of the screen. I figure that diagram assumes you're looking around the top third of the screen, so raise my monitor a bit higher than that.