Well done but I don't have the feeling this will make my ride any better

I think that a bladder like the ones you are talking about don't move into the reservoir, they only bend. This concept use the sliding displacement of a floating piston and the deflection of a membrane, two relative movements.

Is it a perspective effect? hahahaha I tought it was a joke

Some cool designs there! Congrats to everyone! Looks like the DF-350 is the most popular design! This design shows that the creator has a lot of skills in CAD design, but all the bicycles companies claim that their bikes' characteristics are the bests for bumps absorption, cornering, pedal efficiency, braking efficiency, etc etc. I understand the point of the designer: It is the only linkage so far that provides all of the three characteristics he mentioned, but still it is just another combination of different features like wheel path, chain growth, motion ratio, angles, etc. There is tons of other new combinations of these features anybody could make and claim that this is the best combination possible.... I see nothing new in there, as the contest was intended for new ideas. But still an impressive piece of work.

I'm pretty sure that this has been said before, but it led to nothing

No doubt that sealing always provides stiction. But the idea is that, when the pressure differential is not large enough to easily overcome stiction, the flexible membrane will bend to let the gas chamber do his work

Durable: We would have to get the right material for the membrane. And It would be about the same weight as a regular floating piston.