Alistair, 

I have a small collection of invisible sprites. Problem is, I can’t find a place to put  them. They just slip out through any holes, but they still need to breathe. Suggestions? 

Keeper in New Brunswick 

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Keeper, 

The respiratory metabolism of sprites – unlike our own – survives at an optimal level for extremely long periods of time if their air supply is rich in high-grade helium. As such, all you need to do to care for your sprites is place them in helium balloons. The tiny creatures will be just fine and you will have a fetching bunch of balloons – especially if these sprites possess the faerie gift of bioluminescence. 

Alistair