Auditory Screen

Some species, like dolphins, have advanced echolocation capabilities, suggesting the ability to form crisp images from ultrasound reflection patterns.

Being that their auditory cortex is so much larger than ours, and that they use it primarily for understanding the world around them, the true way to share our worlds may be through translation of videos and 3D CAD models into auditory form.

To do that, we could arrange tiny underwater ultrasound speakers ("Auxels") into a large fine-resolution sheet or film, that produces sounds emanating from them following the clicks of a simulated sound emitter on a Dolphin's head, to simulate it's own click (but much lower amplitude than would be required to produce reflection), to trick the brain into expecting for a reflection.

The dolphin's brain may then interpret the simulated click as its own "flashlight", and expect for reflections, which would come after the precise time expected based on the speed of sound under water, but with simulated delays from each Auxel, simulating a 3D surface.

The 3D surface thus simulated, may be perceived by a dolphin as a thing or an immersive environment. So, we can simulate 3D objects. We could even try to simulate letters, and see what resolution can a dolphin capture. Can it understand complex CAD drawings?

More importantly, if dolphins are able to produce directional sounds, we could also use the Auxels as microphones, and implement an auditory touch screen, that dolpins could interact with much more naturally.

And, who knows what they could do then.