Pyramidal accoustic insulation foam, glueable wall mount

apart from looking rather funky, it features a hole to put in the nail/screw for the wall, while the octupus legs are for glueing. The problem is that one still needs special glue, to get things to stick on the pyramidic foam plates.
The pyramids enable sound waves to be coupled into the foam, where they are absobred due to the unelastic foam. Similar to pyramidal anti reflex coatings for optical devices, e.g. solar cells.