Called Alodia, the stool is made of two bent tubes with a sheet steel seat curved around the top.
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Here's a tiny bit of text from Cappellini:
Stool ALODIA - design: Todd Bracher 2010
Stool produced with metal tube and steel plate, seat cut by laser, black plastic feet. Available in two heights, Alodia is matt varnished in white, anthracite, mustard, green, light blue and avio blue colours.
Low stool cm. 46 x 54 x 72 h. inch 18 x 21,25 x 28,50 h.
High stool cm. 46 x 54 x 82 h. inch 18 x 21,25 x 32,25 h.