Three-dimensional display

A three-dimensional display for presenting a three-dimensional image based on three-dimensional data, comprising:

• a light ray controller that has a conic shape or a columnar shape, and is arranged such that a base of the conic shape or the columnar shape is open on a reference plane;
• a light ray generator that is arranged to emit a light ray group including a plurality of light rays to an outer peripheral surface of the light ray controller from below the reference plane and outside of the light ray controller;
• and
• a controller that controls the light ray generator such that a three-dimensional image is presented by the light ray group generated by the light ray generator based on the three-dimensional data, wherein
• a circular first viewing area is predefined to surround a center axis of the light ray controller at a position farther upward than the reference plane and further outward than the light ray controller, and
• the light ray controller is formed such that a plurality of light rays emitted to a plurality of different portions on an intersection line of any virtual plane including the center axis and the light ray controller are transmitted through the plurality of portions while respectively being diffused in the virtual plane, and is formed such that center lines of a plurality of transmitted diffused light rays pass through an intersection point of the virtual plane and the first viewing area.