Temporary architecture can create permanent memory
The tower's future was not guaranteed. Gustave Eiffel received the right to operate it for a 20-year concession beginning at the end of 1889, after which its long-term survival was uncertain. Eiffel spent years demonstrating the tower's scientific and communications value, helping make the case for keeping it.
Most of the 1889 exposition's structures disappeared. The Galerie des Machines survived for a time and was reused for the 1900 exposition, but it was eventually demolished.
The Eiffel Tower remained.
That gives us an important exhibition-design lesson: temporary event structures can create identities that last far beyond the event itself.
Modern exhibition stands work on a much smaller scale, but the principle is familiar. The most effective displays are remembered after the visitor leaves.