Back in the 1980s, to help himself decide whether what he was producing was good design, Dieter Rams drew up what has come to be known as his 10 Commandments.
My personal favourite.
“Good Design is as little design as possible”
Read the full list on vitsoe.com.
His work still looks fresh many years later and is often held up as inspiration for the current aesthetic of Apple product design. You only need to look at his Braun calculator alongside the iPhone calculator or the punched aluminium casing of the Mac Pro alongside his T1000 Braun radio to see how his clarity of design thinking has endured long after the fads of a moment have been confined to the land fill.