What it looks like. For example, a Macintosh Plus running System 7.5.5:
Summary: µvMac (micro vMac) is an emulator allows modern computers to run software made for early Macintosh computers, the computers that Apple sold from 1984 to 1996 based upon Motorola's 680x0 microprocessors. This is a fork of Mini vMac, maintained by InvisibleUp. The original page for Mini vMac is hosted at gryphel.com.
What it looks like. For example, a Macintosh Plus running System 7.5.5: