Circles!

[gloomy sluice]

I have to make a circular object I can link it below and its like im kind of confused on how to get started! https://cdn.discordapp.com/attachments/918514753998037052/1148431933131464774/IMG_5182.webp

[cold horizon]

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[gloomy sluice]

Bottom right corner

[thorn flax]

Personal Opinion, don't make it circular, but minecraftify it.
Circles usually look quite bad in the game.

Otherwise, use cubes and rotate them, a Hexagon is the closest you can get to a circle.