On Cancer Day (10th May) volunteers from the Spanish Cancer Association take to the streets in search of contributions to the fight against cancer. This ad aims to reflect how the public’s cash is vitally important to help the association in its work. It’s quite simple: if there’s money, their research can continue. Suddenly, as we look through the microscope, a shutter closes, preventing us from seeing. It is a telescope-style shutter, so when coins are fed into the microscope slot, the shutter opens and we can go on looking, that is, the microscope goes on working.