At any moment, the brilliant Indian summer we’ve been enjoying can give way to gray skies and pelting rain. That knowledge makes these last days of warmth and sun ever more precious. We look for every excuse possible to walk the dog, delay the house cleaning, pick up a coffee at an outdoor table to gather up stores of sun-induced vitamin D.

The bio-light is on stand-by, ready to flood our eyes with ersatz sun and keep our pineal glands at work during the long spell of dark days.