@DaddyDM @JeremyECrawford wondering how you’d play this in your games, “Can Minor Illusion create a working mirror w/reflection?” wouldn't allow it – too dynamic, requires too many changes moment to moment
— (((Mike Mearls))) (@mikemearls) May 23, 2016
Too dynamic? So you cannot, then, create anything reflective such as metal or a wet surface or a waxy leaf or translucent like glass or a crystal. You can conjure an object out of thin air, but being shiny is too hard??