The largely unseen core of the desk is a sheet metal schiene (rail) system, which provides a lot of flexibility for customers:
"TRAILO is an office table program with a wide range of accessories. The centrepiece is the REISS SCHIENE™?, a sheet metal profile positioned under the tabletop that accommodates various types of table legs, but also a variety of add-ons."
"Some of these add-ons – acoustic panel, document tray and monitor holder – can be moved freely along the REISS SCHIENE™? via a trolley. No tools are needed to assemble and move the add-ons."
"The product is designed in such a way that it can be produced on an Industry 4.0 system in batch size one."
Here's a better look at how the accessories integrate with the rail: