A sensing element and a method of making the same are provided. A method for forming a bend in a composite panel comprises forming a slot having a curved flange in the composite panel, inserting a sheet into the curved flange, and bending the composite panel with the slot and the sheet within the curved flange about a longitudinal axis of the slot to form the bend. In another aspect, the present invention comprises methods for trading currency over a computer network. The thumbnail images are accessible to workstations connected to the network.