Wasps potter around

It is quite common to find wasps building their nest around our house.  While they do indeed potter around, on consulting Roger Farrow's ecological guide to the Insects of South-Eastern Australia I find that these are in fact mud-dauber wasps Sceliphron laetum. 
 All the nests seem to start out like the one shown, but some of them seem to have been decorated - if this is the correct word - with additional layers of mud.
 All the nests comprise cells such as this.
 A paralysed caterpillar is placed in each cell, providing food for the wasp larva which develops in there.

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