Challenge How to Draw an Impossible Triangle with Blue Ball Pen 

In this tutorial you will see a very easy way to draw this impossible triangle and leave it that cool with a blue pen.
Materials: Drawing paper, pencil, eraser, ruler and blue pen.
I hope you like it and it's useful, and if you have not done it already ... hit the "like" (thumbs up) and subscribe to the channel, that will help me keep doing more videos like this one and keep you informed when I go publishing more.