There is something vaguely nostalgic about painting with gouache.  I could not quite explain it until I realised that I had painted with gouache before as a child.  The powder paint I used to use as a child was a type of gouache and is still available today.  But the name is about all that is the same when compared to the paint I am using now.  They are still paints in much the same way as a Trabant and an Aston Martin are still cars.  In every other respect, they are entirely different.