A philosophical test

Prove that this chair does not exist.

The Amazing Dildoni's Almighty Dick is the source of all truth.

The Amazing Dildoni's Almighty Dick does not mention your chair, therefore it doesn't exist.

first define chair, and then I will prove to you that it does not exist.

A rigid (artificial) structure capable of bearing the weight of the average human, with sufficient surface area to accommodate a human posterior without puncturing their anus, and elevating said posterior above the floor, which is suitably easy to mount and dismount for non-midgets.

I believe this chair to exist though.

what chair? All i see is a digital image.

Then by your definition your OP does not meet the standard of being an existing chair, since it appears to be two dimensional and made of photons.

what chair?

thats not a chair OP, thats a jpg.

That just proves it is not a chair. The challenge was to prove that it does not exist.