Why does it not simply form a solid powder at the bottom of the flask?
Does silver also stick to the glass in other silver precipitating reactions?
EDIT: My question is definitely not the same as the one linked (which btw does not have an answer and is inactive for three and a half years).
Normal precipitation of silver from silver ions results in a black powder and no mirror.
As pointed in the comments, kinetics seems to play a major role here, with slow precipitation being key to achieve a mirror.
So why is it that a slow reduction of silver ions make them deposit on the surface of the glass?