This is a suitable bathroom tile. The first impression is a lot like celadon, but a closer look reveals it is not: there are two layers of glaze: the dull, colored on the bottom (the color is intentionally uneven); and the clear on top. The latter cracks when cooling, producing nifty patterns.
The crackle produces more than a web pattern: it also creates an uneven surface. The effect is a little like cracked eggshell: different sized splinters (flat areas defined by the cracks) are all at a slight angle to each other and the horizontal. This is barefuly perceptible in full daylight, but when ambient light is low, it becomes very obvious that each splinter reflects light at a different angle. This produces a nice effect when you half-close your eyes: