The Pop-Up Portable Sensory Dark Den makes it simple to create a calm, ever-changing environment for classroom and home use. Perfect for children who need a distraction free setting or stimulation via glowing objects. Create an interference-free mini sensory room. Designed to provide a quiet, dark, cool-down spot for children to relax and have time to regulate their sensory systems. Ideal for kids who become easily overwhelmed by sensory stimuli, and also for increasing stimulation by adding UV fiber optics, soothing mood lighting, or other light up and glow in the dark accessories. Add plastic mirrors, rope lights, and sensory materials to the walls, and dangle ribbons or fabrics. Portable, pop-up feature provides simple setup without poles, pegs, or ties.