For starters, combo everything (duh). Make sure that the upside down walls (on bottom) are walkable, and the pillar has an unwalkable version as well.

Then, put 3 layers on the screen, making layer 1 transparent.

Lay out the "floor" tiles ON LAYER 1.

Lay out the "Wall" tiles ON LAYER 2.

Put the bottom tiles of the pillars ON LAYER 2, and put the rest ON LAYER 3.

Now, lay out the upside down wall tiles ON LAYER 0.

Put the top tile of the pillar directly below each of the pillars ON LAYER 0, then lay them down ON LAYER 0 as you did on layer 2 from there.

There! Now it looks like the wall and pillars are reflecting on the surface of the floor.