Long bridges made out of light.

In-game Uses:

After being activated the light bridges are used by the player to move from spire to spire, just like the trams. The bridges meet over the central island, roughly over the dais.

Each light bridge has a control panel with an adjustable lens.
One panel is broken and needs to be repaired before it can be used. This is done by rotating several prisms inside the panel, each one sending out a different colored beam of light that reflects off other prisms, until all of them are lit.