These pictures are of a lamp shade by New Zealand based designer Phil Cuttance. This piece is called Segment Shade.
The Segment shade is cast from a simple mould created from eleven individual wedge-shaped plaster segments.
When initially assembled together the segments create a closed circle, resembling a cake sliced into eleven even pieces.
Every wedge is then cut with a bandsaw on a unique angle, each different to the others.
When reassembled each face now intersects at a different angle to the adjacent wedge creating an irregular, asymmetric inner cavity where the Segment shade is slip-cast in ceramic. Each casting inherits the texture of the bandsaw cuts on the wedge faces.
A batch of shades is cast from this arrangement of wedges, then the eleven segments are rearranged, creating a new unique cavity for casting a new different shaped shade.
Every time the wedges are rearranged a new batch of different shaped Segment shades can be cast.
http://www.philcuttance.com/index.php?/segment-shade/segment-shade/
I like this product because of its unique and edgy style. The end product is not sanded down so has a lovely smooth texture on the inside and then a rough texture on the outside due to the band saw.