Mics can be attached to stands or booms using clips. Pop shields block plosive sounds. Mounts isolate frame vibrations or attach mics directly to surfaces. Acoustics is the science dealing with mechanical waves, including vibration, sound, ultrasound, and infrasound. Interior acoustics refers to how background sound interacts with surface noise within an enclosed space. Studio acoustics aim for a very short reverberation time and soundproofing to isolate recordings. Exterior acoustics consider how ambient outdoor sounds may overlap surface noises in an open environment. Foley effects add everyday sound effects in post-production like footsteps or breaking glass.