Bad Visual Controls Example: Software
See the icons on the top of the screen? The developers got cute and put in little icons to represent common functions. The problem is, people couldn't figure out the icons, so someone took a label maker and put words on the monitor. The grouping of test tubes, of course that means “Patients”. The cute chart means “Calibrate”, of course.
I'd say this isn't very “lean” software, if I can use that term. I'd say icons and elements on a screen should follow the rule of Visual Controls in a lean setting: the visual controls should be clear and obvious to an outsider. That means using abbreviations or symbols that the average person can understand.