One of the components of the level design that are critical for developing the characteristic feel of the quick, think-on-your-feet (or glider wing) visual puzzles, is the intra-level tunnel.
In story terms, they serve as access ways and maintenance tunnels, offering the chance at a quick route through the level, but fraught with their own brand of challenges and enemies.
As always, I take a modular approach to asset design, attempting to maximize the utility of implementation with the minimum number of unique assets.
The tunnels segments can added end to end to form long seamless tunnels or broken up with couplers.
4- and 6-way junctions hook in easily using the same joining components, allowing for simple routing through the level.