I need a formal altar for some things I need to accomplish in life. And while The Gods do understand and grant me great leeway there is a certain...push...to have a formal space like that. And the push is both external and internal.

As for hiding in plain sight about the only thing I couldn't hide would be a pentagram. (I live in a really blue-collar neighborhood and I know a bunch of people wouldn't be okay with that even if the garden is behind the garage.)