This is not architecture per se, but is part of the world that is a mesh of art and design. I love the cleverness of this. It really makes you want to sit on it, and makes you think of the origin of leather since that is what it is made from. Designed in 2004 by Julia Lohmann it is entitled Waltraud Cow-Bench.
There are many excellent works showing functional design in the MoMA, but this is what struck my fancy the last time I visited.
Museum of Modern Art, New York 11 West 53rd Street (between 5th & 6th Aves.)