PURPOSE: To provide an altar with a gorgeous and luxurious natural flower group image, by showing a slight number of actual natural flowers as a group of numerous flowers all over a box frame via the kaleidoscopic action of a reflecting mirror and a half-mirror.

CONSTITUTION: The inside of a box frame 3 is clearly illuminated by multiple upper and lower fluorescent lamps 4, 5. A half-mirror 2 is transparent, the inside is visible from the front of the outside, its inner face is a mirror surface 2' facing the mirror surface 1' of a reflecting mirror 1, and two mirrors reflect each other. When some actual natural flowers A are placed between them, the images are reflected together. When both mirrors are arranged in parallel with each other, the images are overlapped. The mirror surface 1" of the reflecting mirror 1 is slightly longitudinally obliquely arranged, the images seen from the front are not overlapped, and the kaleidoscopic aspect is presented as if many natural flowers existed there. Actual natural flowers A and virtual image natural flowers B are seen on the whole front face of the half- mirror 2 in the front of the box frame 3 as numerous images, the aspect of an altar showing a gorgeous and luxurious natural flower group image having a deep depth is presented with a slight number of actual natural flowers A, and the cost can be extremely reduced.