Cat go upstairs or downstairs？

看看这张图，告诉我猫咪到底在上楼还是下楼？

A cat walking on the stairs refuelled burn brain images discussion upsurge.
一张猫咪走在楼梯上的烧脑图片再度掀起讨论热潮。

Some people think that can be seen from the location of the arrows in figure pointed out that the cat is in the downstairs, because from the upper part of the position is can't see the steps of the flange.
一些人认为，从图中箭头指出的位置可以看出这只猫是在下楼，因为从正上方的位置是看不到台阶凸缘的。

小沃也看晕了。到底是在上楼还是下楼呢？你怎么看？