Yes, he must have been refering to "integral photography". I understand how it can record thousands of images on the plate from slightly different points of view but I don't see so far how one is supposed to be able to reconstruct the whole 3D image from it if one doesn't have a fly's brain. That's another mystery to investigate now. Cool!

By the way I'm sent Ray my take on the translation of the first Lippmann paper from 1891.