Tek Pillar

The Tek Pillar is the end-game unlockable pillar. It's part of the Tek Tier-building set. A pillar is a stackable form of a foundation, which is required for building any kind of housing or storage structure.

Construction
The Tek Pillar can be placed on even or slightly uneven ground, or on the top or bottom of foundations, ceilings, or other pillars. Once the first Tek Pillar is placed, subsequent pillars can snap into place on the top or bottom of the first one, provided there is adequate room to do so.

A pillar or series of pillars with the bottom touching the ground and a ceiling on top will function as a foundation, providing support and allowing structures to be built on top of it.