Earlier this year I posted about the mosaics in the National Gallery.
Another major London art gallery also has a fabulous mosaic floor, and this can be found in an octagonal room at the back of Tate Britain.
Dating from 1923, eight panels by Boris Anrep illustrate William Blake's 'Proverbs of Hell'.
Some of the statements within it are wonderful. I particularly like "The Cistern contains, the Fountain overflows".
Read more about it here.