And provide free chiropractor services to layout operators who have to perpetually stoop.... (sorry, pet 'issue' - don't know how to resolve to absolutely everyone's satisfaction - no offence intended!)
A bench I front of the high ones? Given a lot of exhibitions are in sports halls! Took my 4 yr old to an exhibition today - so frustrating for him and me!
As CK says, no ideal solution here. Probably best to have a range of layout heights at exhibitions (which from my experience is the case) as well as a few footstools and periscopes.