Adam has written a book about his experiences called "My Incredibly Wonderful, Miserable Life: An Anti-Memoir." The photo above, and the one directly below, come from the official site for the book.
Thanks to these pictures, we now know what young Spock looked like a a child, during the events in the animated episode. "Yesteryear." Also, too bad they never used him in the original series! How great would that have been, had there been more seasons? A live-action version of "Yesteryear," featuring Adam as the young Spock, with Mark Lenard and Jane Wyatt reprising their roles as Sarek and Amanda, would have been awesome. Yes, there was a missed opportunity there for sure, as far as we fans were concerned. Heck, even a guest-star appearance in one of the spin-off shows as Spock's son whom we never saw before. One can dream , can't one?
Above is the famous picture taken when the crew set up Nimoy during a scene to be surprised by Adam whom they had put in makeup!