Enantiodromos

So, I asked this question once before in the regular hero rules discussion area, but now I have 5th ed, and feel justified in asking again: Do you have to buy invisible power effects with Images? Or is there nothing about the fact that the (image of the) chair over there "comes from" some guy, that would tip somebody off to the fact that there's something "amiss" with the chair? If not, what does Invisibility and Images look like, and how does it function?