Secret inside

This one has got a bowl inside a bowl inside a globe, and inside you get double colours. But I really wanted that on the outside and forgot that the white opal would block the double illusion effect. I know what to do to get it, though it'll be too late for SOFA New York which is where this one is destined for. Might be effective if you shine a light inside. Or else it'll be a secret effect when you look inside - like a beautiful box with an elaborate interior.