In design, a "solid piece" refers to a 3D object created from cross-sectional profiles.
"Pat it up" often refers to the final step in fluffing up a vacuum-sealed product, like a or a duvet insert , to help it regain its original loft and volume. In a creative context, it can also mean applying material, like the "performance art" of patting gum onto Seattle's famous Gum Wall. pat_it_up
Since you're looking for a "solid piece," here are a few ways to interpret that: 1. The "Lofty" Piece (Home & Comfort) In design, a "solid piece" refers to a