Created Like His Own Image

What did god mean when he said when god said he created human like his own image. If we resemble God physically, what purpose does that serve. Many books scholar claim, God can take any form he wants, meaning he doesn't have a particular form. If he doesn't look like anything in particular, how can he create something that looks like that. That seems contradictory. Could that saying be metaphor for godly power? His power enables him to create. Is it possible that he gave the same power to create to human , and he just have to figure out  how to unleash it?