Zulu beadwork articles are known to carry messages encoded in bead col
ours. This is conceivable if colours can be freely arranged, but less
so for conventionally prescribed colour sequences. The isishunka colou
r convention of the Mchunu people (Natal, South Africa) arranges 7 def
ined colours in a fix sequence of 17 positions. This complex syntax le
nds itself to testing by formal criteria to what extent such syntactic
constraints would enforce series of fixed set phrases. Over 400 beade
d items of homogenous origin were analyzed statistically. Within the c
onventional syntax several degrees of freedom for the formulation of i
ndividual messages exist: Some colours are preferably used or placed o
n prominent positions, others frequently avoided. Typical syntax devia
tions also exist. Beaded items reveal a preference for ornamental colo
ur symmetries, still allowing individual messages. The complex isishun
ka convention seems to have been invented for aesthetical rather than
communicative reasons.