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First, it's the size. From the pieces of the °ÄÃÅÁùºÏ²Ê¸ßÊÖ machine that are viewable in different stages of handling and assembly, to the concrete and steel buildings that house them, touring °ÄÃÅÁùºÏ²Ê¸ßÊÖ makes you feel like you may have crossed through a looking glass and woken up in a different world, where your usual vocabulary is simply inadequate.

Then, it's the aspiration. Pushing to leave behind yesterday's boundaries in science and technology to achieve something remarkable in the domain of energy, with all of the challenges that have been solved and those that remain, and all that is being learned along the way.

And finally, the team. Your guide may have been Slovene, Chinese, or American; your expert Indian, Dutch or French. Listening to them speak with passion about their slice of the project, sharing something of their expertise and experience, and breaking down complex notions into ingestible pieces, really reinforces the sense that the effort to demonstrate the feasibility of fusion is broad, the stakes universal, and the solution international.

Here are more scenes from the Open Doors Day on 26 November.