Foam cubes are solid, light, compact and stackable. They can be used equally well for low seating during short conversations as for simulating elements of 3-D space at scale. These cubes can be configured into building blocks like walls, beds, a dark enclosed room. You can make cube castle, setting the stage for brainstorming on the topic of security. These tool foam cubes is a 1.7lbs density and has the ILD of 70.