Synopsis of "Sora Iro no Tane"
by Jonathan Nicholson
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The fox character trades a sky coloured seed to a boy for the boy's toy
plane, the fox leaves thinking he's gotten the better deal. The boy then
plants the seed and it grows into a house where everyone (animals and all)
wants to be a part of and have fun in his house. The fox returns sulking and
undoes the trade, giving the plane back to the boy, and the fox gets what is
now a huge mansion type thing....but alas the fox looses it all when the
bubble bursts and the house disappears.

To me it seems like a story of greed and envy, and that if you give into
those emotions you'll end up losing it all... The animation is basic yet to
me puts the moral across very clearly.