Do you know what is depicted on the photo?
Sorry for the quality, it’s the best I managed to extract from my phone’s camera.
On the photo you can see the insides of a vacuum tube, which I found on the circuit boards of a really old TV set. These tubes were predecessors of our modern transistors. Hard to imagine what dimensions computers would have had if they had been working on the tubes.
More on this: https://en.wikipedia.org/wiki/Vacuum_tube.