Turns out robot maker Festo did more than just dream about robot tentacle arms; they instantiated their idea, using elephant trunks as their model. Take a look at this demonstration video.
(Festo Bionic Arm)
I was also fascinated by the fabrication process, which creates lightweight, flexible and energy-efficient robotic manipulators.
Festo has been very creative in the last few years; take a look at some of their work:
Festo Aqua Ray Robot
Aqua_ray is a remote-controlled fish driven by water hydraulics, the shape and movements of which have been based on the model of a manta ray.
Robot Arm With Fluidic Muscles
The company describes it as a "combination of mechatronics and the biological model of a human being."
Drosophila Robotica, The Mechanical Fly
'... the Scarab [flying robot] buzzed into the great workroom as any intruding insect might...'- Raymond Z. Gallun, 1936.
Robo-Raven Flapping Wing Robot Bird
'When he had first built them, they had been crude indeed, flying mechanisms with little more than a reflex-response unit.'- Philip E. High, 1968.
Bartendro Robot Bartender
'He sipped the cognac that the robot bartender handed him...'- Alfred Bester, 1956.
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Sky City's 220 Stories Are Go
'It rested among green parklands and... stood in total isolation, a glittering block of whites and flashing windows dotted with colors.'
Robo-Raven Flapping Wing Robot Bird
'When he had first built them, they had been crude indeed, flying mechanisms with little more than a reflex-response unit.'