I've wanted one for ages. I was going to try and make my own but impulsively bought one from Waitrose today. It's very pretty! There's no moisture on the glass though - should there be? I've just briefly taken the lid off to straighten a bent leaf and it felt warm inside. I hope I haven't upset the balance by doing so. It's on a shelf nearish the window so shouldn't get any direct light but is in a sunny spot. What do I need to know?