Lenticular arrays are commonly used on stickers, cards, and screens. They involve the placement of small ridges or lenses on a surface. The ridges cause a difference in the way light is reflected off the surface and cause the illusion of a 3D image. This method can also be used to increase the brightness of a screen. However, this technology is costly and a bit difficult to implement. The other method of autostereoscopy is holography. Holography is a concept that has been seen a lot in science-fiction, but it seems to be coming a bit closer to common use due to increases in technology and reductions in the costs involved. It involves showing visual scenes using holograms. Since these are three dimensional and involve no glasses, holography becomes a type of autostereoscopy. We cannot help but imagine the day that we can be seating on our living room couch and we can be surrounded by an astoundingly beautiful rainforest that we can see from multiple points of view. Whichever the method used, glass free 3D seems to be coming closer and closer to common use. The day that such devices become the norm rather than the exception seems to be coming nearer and nearer. Watch out for it!!

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