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Wind chimes come in all shapes and colours.  Some are very simple designs with just metal cylinders hanging down which chime in the breeze.  Others are quite stunning designs with wildlife and spirals with balls.  A good place to hang these is on the outside of greenhouses on a hook.

Then while you are outside gardening in your greenhouse you can listen to the gentle chimes which is quite relaxing.  It is best to bring them in during the winter as they can become damaged in bad weather. Or you can just buy new ones each year if you fancy a change!