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We present experiments which show that the partial wetting of droplets cappedby taut elastic films is highly tunable. Adjusting the tension allows thecontact angle and droplet morphology to be controlled. By exploiting theseelastic boundaries, droplets can be made elliptical, with an adjustable aspectratio, and can even be transformed into a nearly square shape. This system canbe used to create tunable liquid lenses, and moreover, presents a uniqueapproach to liquid patterning.

Droplets capped with an elastic film can be round, elliptical, or nearly square