Stretched Canvas was introduced in the 3rd Anniversary Update. 2 of them are needed in the recipe of Da Vinci Wings.
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It is purchasable from Locke The Travelling Salesman for 30 World Locks.
WARNING: It can be destroyed if you place another background over it.
In-Game Info:
It's not the prettiest decoration for your world, but it's probably got some other good uses.
This item can't be spliced.
This item never drops any seeds.
This item can't be destroyed - smashing it will return it to your backpack if you have room!