Cushion
Graphics by
Paul Bourke
March 2003
z
2
x
2
- z
4
- 2 z x
2
- y
4
+ 2 z
3
+ x
2
- z
2
-
(x
2
- z)
2
- 2 x
2
y
2
- y
2
z
2
+ 2 y
2
z + y
2
= 0
