The Portal Box (1990) was the first to utilize compact battery powered drills and sheet rock screws for its construction. The design was shaped by the form of a crouch with knees to the chest. The head protrudes and allows for the application of masks and other appliances. The Portal Box, between the bump outs to accommodate the feet, gives access to the genitals. It also serves as a tunable port for the bass reflex speaker addition.