Furniture Design THA Chair by Jun Nakano Tha is a four legged armchair that can be stacked from the front as well as the back. This is a revolutionary idea in chair history, already patented and very convenient. It can easily and smoothly be stacked with a slight lift from the back, even if the table is in front. Nothing has been sacrificed in design or seating comfort for this feature. It is designed with simple lines that do not require excessive handwork.