Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Society6 - Indigo Blue Ocean Throw Pillow by Pure Nature Photos
Product description: Indigo Blue Ocean Indoor Cover (16" X 16") Include Pillow Insert Throw Pillow by Pure Nature Photos. Nature,Photo,Landscape,Vintage. Throw Pillow made from 100% spun polyester poplin fabric, a stylish statement that will liven up any room. Individually cut and sewn by hand, each pillow features a double-sided print and is finished with a concealed zipper for ease of care. Sold with or without faux down pillow insert.
Product feature: Stylish and Functional Throw Pillows, Artwork by Pure Nature Photos, Compatible with: Cover (16" x 16"), An independent artist profits from every purchase on Society6.
Product brand: Society6
Target attributes: Shape
Answer: attribute: shape
value: 16" x 16
source: product feature
attribute: shape
value: 16" x 16"
source: product description