An asymmetric object, such as a lighter and ashtray, a clock and a base, a model airplane, etc has a base and the object levitates from the base. The ultrasound transducer is configured to ablate myocardial tissue by applying ultrasound energy to the myocardial tissue such that at least a portion of the transmitted energy is reflected by the reflective region onto the myocardial tissue. The grid is then placed at a second potential, the second potential being between the reference potential and the first potential, before the beam is directed to a second point on the trace to cause emission of secondary electrons. In one embodiment, the method further comprises obtaining first and second array sketches from first and second locations respectively, and constructing a wavelet representation of a linear combination of the first and second array sketches. For example, a copolymer perfluorodecyl methacrylate and 2-nitrobenzyl methacrylate is a suitable orthogonal fluorinated photoresist for use with fluorinated solvents and supercritical carbon dioxide in a photolithography process.