The door flies open.
The man rushes in who wants to have solved some of the greatest human problems of our time in a few years.
The world's energy needs, global warming - things like that.
Moritz von der Linden, 49, black glasses, shirt under sweater, like the villains striving for world domination in old James Bond films, has a model in his Munich company that should illustrate his ingenious plans.
It consists of a group of beige-brown low-rise buildings with removable lids, underneath something technical vaguely suggested.
The principle of nuclear fusion seems simple and ingenious, but its practical implementation has so far apparently exceeded the limits of what is possible.
Physicists self-ironically call this the “fusion constant”: It is still 30 years until nuclear fusion can be used.
And that has been the case for 50 years.
Marvel Fusion wants to do better now.