We like to refer to those as "safety chairs." They are to be used when you feel it would be unsafe to work due to excessive heat, extreme hunger, loss of ambition, or presence of alcohol. There are many reasons to promote the use of such a safety device but too many to list them on here. Not to mention that I may overlook some and I don't want to cause a safety violation somewhere, but you get the idea. We have some chairs just like that, and danged if they wouldn't make great structure wouldn't they??