A very similar tile but in poorer condition is in the Keir Collection (Grube, Ernst: Islamic Pottery of the Eighth to the Fifteenth century in the Keir Collection, London, 1976, no.263, pp.301-3 and col.pl.p.296). Four very similar tiles showing a variant on the theme of this tile, with the two darker octagons per tile aligned parallel to the sides rather than offset as here, were exhibited in 1987 ("Art from the World of Islam", Louisiana Revy, vol.27, no.3, March 1987, no.179, p.103). In his caption Dr. Oliver Watson suggests that they were probably from the tomb of Buyan Quli Khan near Bokhara. A further fragment of that design is in the David Collection (Folsach, Kjeld von.: Art from the World of Islam in the David Collection, Copenhagen, 2001, pl.224, p.174), while another is in the Keir COllection (Grube, op.cit, no.264, p.303).