Title text:
Pontoon bridges are just linear open-sided waterbeds.
Transcript:
Bridge Types
[A 4x4 matrix of 16 ways to cross the same rectangular hole in the ground]
Plank [shows a plank laid over the hole]
Rope [shows a rope bridge with rope guardrail]
Truss [shows a truss bridge with a triangular truss above the bridge deck]
Trestle [shows a trestle bridge]
Arch [shows stone arches supporting a straight deck]
Suspended Arch [shows a single arch, with the bridge deck suspended from it]
Draw [shows a truss bridge, with one half opened like an unrealistic draw bridge]
Suspension [shows the bridge deck suspended from a cable strung between two pillars and the shores]
Filler [shows the hole filled with dirt and stones]
Budget Overrun [shows a bridge deck suspended by cables from an artistically shaped pillar]
Jump [shows two ramps at the edges of the hole, and a skateboarder jumping across the hole]
Halfhearted [shows a ramp at each side of the hole that leads down to the bottom]
Waterbed [shows the hole filled with water, two fish and an octopus, a wobbly covering, and two stick figures crossing]
L'Engle [shows the hole warped such that the opposite shores meet]
Fun [shows a loop-de-loop rollercoaster bridging the hole, and a skateboarder using it to get across]
Repurposed Elevator [shows an elevator tower, rotated sideways as a whole, laid across the hole. 2 stick figures using the elevator are also rotated.]
Source: https://xkcd.com/3097/
Wow, did not see that coming. That is cool as hell.
It's almost disappointing when the absurdist punchline of an xkcd comic is an actual thing that exists in reality. But then again, it's cool as hell.