I think a paper menu is good, especially for a restaurant that you will sit down and they will come to take your order. If changes are made, they could save pap

I think a paper menu is good, especially for a restaurant that you will sit down and they will come to take your order. If changes are made, they could save paper and ink by only printing pages that have changed rather than all of them. They could also be made in a reasonably compact format, which also saves paper. Sometimes you don't want to print out a copy; in this case, e-ink displays might help. I think e-ink displays would be useful for many kind of business signs that do not need to be changed but sometimes do, e.g. daily (or less often, e.g. the business hours sign, which might have different hours each day of the week but the sign will list all of them so doesn't need to change very often). A QR code won't help in case the customer cannot use it (although I have seen a restaurant that provided a iPad for customers who needed it; the only time I was ever at such a restaurant, I was with someone else who already had a iPad, although they did not always bring their iPad with them so they might not have had it and needed the one provided by the restaurant if they didn't bring it with them). A compressed representation of restaurant menus in a computer file might sometimes be useful in some circumstances, too, although this does not really substitute for any of the above.