オサンポ walk - 謎の小さい通行止め (？) the closure (small)

通行を
止めたんだけど
通るキミ

We blocked the pass
But you go through
Don't you

ビルとビルのスキマになんか衝立てがあってそこに縦長の出入り口(？)に見える切り口があってそれが塞いであって、紙(？)と丸石で。何のためので、誰(何)が通っているんでしょうね？ って誰(何)か絶対通っていますね？？
ある日の様子が、下の写真に。

この感じ、誰(何)か、ここ通ってますよね？
猫には小さい感じです。ねずみ？ ここら辺でねずみを一匹、一回だけ見たことありますが！！

There is a wall between buildings, a part of the wall has been cut in vertically long, it seems an small entrance ... for mouse, for cat, too small, the entrance has a door(?), it's paper and a round stone. It seems they block the entrance. Who (what) go through it? I'm sure someone (something) definitely goes through??
One day, I saw this scenery in the second photo. The paper door pushed out, lying on the ground. And also the stone moved a bit. It cannot block the entrance. It's for mouse? I saw a mouse around here once!!




*I'm not sure if my English grammars' are correct.