>>45253121The red lines represent parallel surfaces. The floorboards, railing, and column caps all follow the same plane, since they're part of a rectangular building and those are usually... straight.
Since those lines are parallel to the horizon (a floor is flat, no?) they should converge towards the horizon.
Not only are they converging several miles above, they're not even converging.
(Also the yellow lines show the back wall not converging at all despite being in three-quarter perspective and the floor having perspective converging worthy of a wide-angle lens)