Engineers have tans that end where their T-shirt begins.  Mostly this is an accident – when an engineer is given an office with a window.

As a IC layout engineer, I have often been accused of being a troglodyte – a cave-dweller.  This suits most of us layout folks just fine because we work on a black background and therefore light is bad.  Unlike most layout engineers, I work on a white background (having been trained-up in architecture, not IC layout).  I can also therefore handle light, but not too much.  Currently, I have a window office.  The light—it burns!  I keep the blinds closed except on rainy days.  It helps me to avoid an engineer’s tan.