What the... is this

[iAMtHESushighost]

What is that!? gm was on and it was at spawn so I asked him to break it and I asked him what it is and he said hes not gonna tell me what it is because it would be placed everywhere and when i right-click i get Disconnected by server: Internal server error i cant see the outline if i look at the lower block as you see its invisible and it sounds like a pump. I wouldn't place these everywhere its just that my sense of curiosity is getting the best of me and i MUST KNOW WHAT IT IS!