The Hyperspace Bust is a Pre-Hardmodefurniture item. Similar to Monoliths, it can be activated either by ⚷ Open / Activate or with wires, changing the current biome into the Hyperspace Biome for nearby players.
The Hyperspace Biome is a "biome" that only generates a Hyperspace background, visual effects (VFX) over the foreground, and music during day and night.