After getting light with the projector Reny can talk to a bridge.
But the bridge is too heavy for Reny to hold onto it.
This is the low-spoiler guide for "Helping the bridge" puzzle in Kapia. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.