As they slowly but surely move toward intimacy, the time finally comes to consummate their love. At first, each seems cheekily cautious of the other, testing the waters with intellectual quips and hurried touches. Guadagnino films Oliver and Elio in gorgeous light, making a meal out of each actors’ unique physicality. Italian summer days shine brilliantly across the screen in “Call Me by Your Name,” charting its central budding romance with a kind of buoyant grace and dignity.