Oh...wow. I did research on Jason and the Argonauts two years ago, and I know just how much effort he puts in his work. Some additional details about that film I came across during
my research:
During the Talos scene, not only did Harryhausen make a small clay figure, the production team also made a life-size foot for the unpegging scene.
Did you know that, during the skeleton fight, the actors were actually fighting with thin air? They had to memorise every move they made. During practice, they sparred with stuntmen, but on the final take, the stuntmen weren't there. The entire fight scene was choreographed by Harryhausen himself. That's why it's so impressive.
RIP, and well done for living a full life.