Trying to Identify a Technique

[Feralpeg]

I recently attending an art show. One artist featured photos that appeared to change based on the angle at which they were viewed. For instance, there was a photo of a tree. From one angle, it was a summer scene. The tree was leafy. From another angle, it was a winter scene. The tree was bare. I've tried googling this, but haven't been able to determine how this is done. Any input would be appreciated.

 

[IamSam]

Hello and welcome.

It's called Lenticular Printing.

 

[Feralpeg]

Hello and welcome.

It's called Lenticular Printing.

Thank you!