Who is behind the curtain ?

<br /> See the Pen <a href="https://codepen.io/GODNOOB/pen/RwPMRXV">What’s behind the curtain? – Glitch Backround</a> by Lino Casu<br /> (<a href="https://codepen.io/GODNOOB">@GODNOOB</a>) on <a href="https://codepen.io">CodePen</a>.<br />