Figure 3: Front view: device/module/cell, standing upright and illuminated from the rear, at four different points in time and for four positions of the water droplet. The gold grounding contacts are observed as meander-shaped dark lines; to increase overall transmission, these might be substituted by other transparent ITO contacts in the future. All contact structures are designed such that the droplet can be moved in any direction, that is, horizontally, vertically, and diagonally, depending on the sequence of application of voltages to the contacts.