[povray] How to render seams of adjacent tiles?

[felipesanches]

I am trying to recreate this scene from the game Little Big Adventure 2.

So I decided to start by designing those red chairs.

I first created a prototype manually, focusing only on the shapes, not caring for colors, and using only the parts I have available in my small pile of bricks:

Then I created a digital model of that on leocad using better colors and a few parts I did not have available here.

When I rendered it using POVRay, though, the tiles on the floor ended up looking like one giant floor without seams.

How could I get a rendering result that properly shows the lines separating the adjacent tiles?