Religion. Discuss ( or should that be argue )

Can you explain to someone (me!) who has never seen (or otherwise experienced) an 'angel' what form they take or what they do ?

(just trying to get an idea of quite what you mean by the idea that there are 'angels' amongst us doing 'god's work')

If look at this picture you can see one

it's very small the reflection is just visible in the window above the Hotel sign.