Simply add water.  The more water the greater the risk of an error ... or ... is that creativity?

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Watercolour has taught me to be careless, care free and explorative.  Often working on several pieces at the same time - (because I am somewhat impatient) - allows for mistakes to flow freely leading to very creative outcomes.

 

Watercolour really is simple, and making it complicated causes confusion, which can allow creative mistakes to happen very quickly.