The ability to build structures using the blocks is something we need to look deep into.

By placing the blocks alongside one another we could build simple to complex structures in the island. 

Tables could simply be built by placing the D blocks while this can quickly grow to a complex structure scaling to the imagination of the player.

We can drop screenshots of some complex structures we built in the comments section and see the weird creatives; 

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Here's a video for the blocks assembling