Everywhere

Throughout the years Santa had enjoyed the hospitality of many households, he was forgetting however that he was not as slim or agile as he used to be; infact more and more he was finding that the development of the 'magic key' instead of the chimney was his saving grace.

Taken from the notion of quantum physics that everything is split up into sub-atomic particles so tiny that in theory we are all interlinked, immersed within a sea of energy.