This is not a specially designed birthday cake. It is not a palette too – it is called Clown Nudibranch. This bright and uniquely colored sea slug can be found in the intertidal zones of temperate southern Australia and northern New Zealand.
*SAGAMINOPTERON PSYCHEDELICUM NUDIBRANCH ~ Originally described from Guam, this animal is now known from many parts of the tropical western Pacific Maximal size : 20 mm. Frequently on the reef flat zone and the fore reef zone. (psychedelicum, indeed.