Don't get me wrong - I admire the Selectrics for the engineering marvels that they are. It's just that those particular machines are indelibly linked to office work in my mind. They were on every secretary's desk during the biggest chunk of my career.
Speaking of Macs, I remember the day I first started using them. December 13, 1988. It happened to be my hire date with a company that was closely partnered with Apple. The secretaries still had Selectrics right next to their Mac Pluses, 512Ks, and SE's for at least another decade. The Macs progressed through the IIcx, IIfx, various Quadras and Pizza Box models, and finally to the iMac - but the Selectrics never changed. My, how disposable technology has become.