That's a bit of a letdown. This exhibition was the first major introduction of wet folding which allowed curved structures and opened up a whole world of possibilities. You can find plenty of images from Yoshizawa but I can't seem to find any from this in particular.
British Origami: the 1955 exhibition by Akira Yoshizawa (2005)
https://www.britishorigami.org/cp-lister-list/the-1955-exhibition-by-akira-yoshizawa/