Back when Nortel was king and still called Northern Telecom, they made simple easy to use telephones with simple button layouts and futuristic styling. What I find interesting is that it appears the original Designers of the newer (1990) M2000 Aries sets, mimicked the simple styling of the original 1a2 Logic Telephones (1974). Here are some photos below showing the comparison. I borrowed some screen shots from web searching.
Logic 6 = M2006
Logic Single Line = Unity NT4L01AH Single Line Set