A blow-up chair? Ikea has been here before. It attempted to make inflatable furniture in the mid-1990s, when designer Jan Dranger came to the Swedish company with a revolutionary idea to solve one of its biggest challenges: how to squish sofas into its preferred flat-pack format, simplifying transport and cutting costs. It sounded like the perfect solution. Made from durable and recyclable polyolefin plastic, the chair and sofa designs could be inflated at home using only a hair dryer. Transport volumes would be cut by as much as 90 percent. Sadly, only after the “a.i.r" collection launched in the 2000 catalogue did Ikea's ambitions become deflated. Staff in stores said that the easy chairs and sofas looked like groups of "swollen hippos” in the furniture displays. Customers forgot to set their hair dryers to cold before inflating. Hot air takes up more space than cold air, so inevitably the sofas deflated as the air inside cooled.…