+d by Ash Concept Arch Ruler Blue The following is a quote from the official website: 【Easy to hold and pick up, an arched ruler The Arch Ruler is a slightly curved ruler. Because it's curved, it's easy to hold and pick up, and you can find it even if it gets lost on your desk. Also, the ink from lines drawn with a pen is less likely to bleed under the ruler. 〈2007 Good Design Award〉】 Although unused, this item has been stored at home. Please consider this before purchasing.