A device can include a body having a top surface, an opposing bottom surface, a first face and an opposing second face. The first face can have an opening therein. A light source can be positioned within the body. The light source can be configured to create a beam of polarized light. At least a portion of the beam of polarized light can be directed outside of the body through the opening in the front face. At least one polarization sensitive detector can be positioned within the body. At least one light can be positioned on or in the first face. At least one target can be configured to be visible through the opening in the front face of the device. The lights and the target can be configured to illuminate in a predetermined manner or pattern.
