How do 3D holographic things work?

Question

My friend has a bookmark and I cannot figure out how the images move around in a circle!!!

Does any one know how they work?

Answer 1

You may be referring to lenticular lens printing... Often confused with holograms. Either way the technologies allow multiple images to be displayed as animation or 3D. This is done by the substrate/material only revealing a few of the numerous images contained in the artwork at a time. A hologram does this by refracted light hitting the interference fringes that were created with a laser within the holographic process. A lenticular lens has ribs that only focus and display a few of the interlaced images. Both processes are similar but still vastly different. If you run your finger nail over the surface of the image and feel grooved ribs it's lenticular... If not, it's probably a hologram.

Answer 2

Try this link.  /rhy

http://www.3dglassesonline.com/how-do-3d...