1. An image displaying sheet, comprising: a composite image comprising plural composite image units, wherein said plural composite image units are arranged in a two-dimensional array, wherein said plural composite image units have a first image period along a first direction and a second image period along a second direction, wherein said first direction and said second direction are different; and a lens array stacked on said composite image, wherein said lens array has a first surface and a second surface opposed to said first surface, wherein plural lenticular lenses are distributed on said first surface, and said composite image is stacked on said second surface, wherein said plural lenticular lenses on said first surface have a first lens period along said first direction and a second lens period along said second direction.