Embodiments described herein use stochastic inversion in lower dimensions to form an initial model that is to be used in higher-dimensional gradient-based inversion. The guidewire comprises a rotatable body and a proximal shaft. The cavity has a tooling, on which at least one photodiode is mounted. The discrimination medium A appears to be red at the support 10 and the film 20 when viewed from the front, but at a larger viewing angle, the film 20 changes to blue by the blue-shift of the polymer cholesteric liquid crystal so as to exhibit a color different from that of the support 10. The mobile communication device sends the caller identification to the headset upon a determination that the headset is in communication with the mobile communication device. These reactions may be conducted reversibly, and if performed in a suitable cell, the cell will serve as a hydrogen storage and release device.