The foam cutouts in the shape of a desk can be used as a backing for sofa or armchair cushions.
For a sofa type backrest, the inclined plane should measure approximately 45/50 cm. The difference in thickness between the large base at the bottom and the small base at the top should be between 12 and 20 cm.
We always use soft foams with a density between 20 and 35 kilos. Because the weight on the backrest is very low compared to a seat