Brick Two Half Hitches

Need a knot that will slip, but is more likely to stay tied than an overhand knot? The two half hitches just might be what you need.

For this knot, I thought it would be interesting to give it a brick texture. I was trying to create a procedural texture and was trying to give it detail.  While I think I could do a better brick texture now, I think this one actually turned out pretty decently.  This is a relit variation to better who off details.