1. A method, comprising: detecting a presence of a conductive object on a sensing device; determining a velocity of the detected presence of the conductive object in a direction substantially orthogonal to that of the sensing device, wherein the determining the velocity comprises: determining a capacitance of the conductive object on the sensing device over time, and determining a differential of the capacitance over the time, wherein the differential is representative of the velocity of the presence, and; recognizing a tap gesture based on the velocity, wherein recognizing the tap gesture based on the velocity comprises recognizing the tap gesture based on the differential of the capacitance.