X-ray exploit with fence gate and sand

I saw a second bug related to viewing through walls, which can be done using sand and a fence  

1. First, we need to make a tunnel: 2 blocks high and 2 blocks long
2. Afterwards, we must put a gate on the first block, and then go further and start pouring sand on ourselves in the amount of 2 blocks 
3. Then we will be pushed towards the gate, which will stop us, and then to start looking through the walls we just need to align ourselves between the sand textures. Please watch the video for a clearer flow of work.