Abstract: Markers and a system for use for autonomous vehicles which can help autonomous vehicles to be aware of their surroundings and/or their spatial location. Such markers can include metallic signage having one or more openings and which can include a front that is spaced a distance from a backing plate. The markers can also include patterns that are stamped, cut or otherwise formed in or on a roadway. When a vehicle traverses over the patterns, a sensor, which can include a sound sensor, can detect the sound or vibration produced by the pattern. Once the pattern is detected, the autonomous vehicle can access a database or other repository of patterns (including but not limited to internal memory) and thus obtain information about the location that the vehicle is traversing.

Abstract: A seamless, shadowless, rear projection full dome imaging system comprising a 360° screen having a plurality of translucent screen sections, a rigid superstructure to which the screen sections are attached; clamping rings to hold the screen sections together; clamp arms to attach the screen sections to the superstructure, a transparent light guide attached to each clamping ring; adjacent screen sections being held between adjacent light guides by clamp arms; a plurality of projectors projecting a light image onto the rear of the screen sections; the light guides having a rear face angled perpendicular to the projected light; and a narrow front edge on the front side of the light guide. All surfaces of the light guides, except the rear face and the narrow front edge, are coated with a black opaque finish.

Abstract: A seamless, shadowless, rear projection full dome imaging system comprising a 360° screen having a plurality of translucent screen sections, a rigid superstructure to which the screen sections are attached; clamping rings to hold the screen sections together; clamp arms to attach the screen sections to the superstructure, a transparent light guide attached to each clamping ring; adjacent screen sections being held between adjacent light guides by clamp arms; a plurality of projectors projecting a light image onto the rear of the screen sections; the light guides having a rear face angled perpendicular to the projected light; and a narrow front edge on the front side of the light guide. All surfaces of the light guides, except the rear face and the narrow front edge, are coated with a black opaque finish.