Let's say that objects also contracts in y and z direction. Let's cut some part of the wall.Firstly we look from the frame of the wall.In wall's frame the length of the piece contracts,so it can easily pass through the hole on the wall.Now let's look from the frame of the piece.Here the length of the hole contracts,it means that the piece cannot pass through the hole.Conclusion is the objects cannot contract in y and z direction. Now my dilemma. There's a garage,whose door opens with neglible time.The length of the garage is equal to the length of the car.Doors close when the car enters the garage. The car is approaching to the door with some velocity.In garage's frame the length of car is shorter ,so no problem here.But what if in car's frame the length of the car is longer than garage's length.In garage's frame he already entered inside and the doors are closed.Because the length of the car in car's frame is longer,what is happening here?