During one memorable journey to our Base Camp site we passed a huge rock face containing one massive fold and were all impressed by the sight, considering the millions of tonnes of rock being folded into this perfect circular shape.
Some years later, in another location completely, I happened to find the very centre of a fold in some Proterozoic rock formations and could not resist the urge for bring it back for closer examination.
It still impresses me no end, despite its small size and reminds me of the immeasurable forces that were experienced when these original rock formations were created.