Koi Fish Pond

This is how to make an accurate representation of a Japanese koi fish pond

Use the round roof shape to make the bridge by duplicating it and sizing it smaller, then group and add details.

To make the rocks surrounding the pond, use a circle, and flatten it down a little bit to make a rock shape. then, duplicate them in a circle. After that, add more rocks and make them green. This will be the moss

First, you need to stack rocks on top of each other to make a rock pillar for the waterfall. Then you need to make a curve shape and duplicate it so it looks like a waterfall and add circles to make the foam at the bottom. Then, to add the pond water, size a cylinder to fit the rock outline.

To make the koi fish, you need a cylinder and three paraboloids for the tail, and fins. Then, use two black circles and two lines to make whiskers and eyes

All you need to do now is assemble the parts together and you're done!