The phrase "must have been designed by an engineer" likely applies to the elevator control panel shown on the left below. When first encountered it looked like there were three options for floor #1 and you had to study it awhile to figure out what was what. Conversely, on the right, different functions are located separately and the emergency functions are highlighted in red. I found that the book at the link below is a really good introduction to design principles.
https://www.amazon.com/Design-Everyday-Things-Revised-Expanded/dp/0465050654
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