It’s apparently the year for especially fantastic homemade Halloween costumes. We’ve seen one parent craft a cute and furry tauntaun costume for their toddler, and now Redditor Renz2LK has made an Optimus Prime costume for his son. It’s not just any Optimus Prime cosplay — it actually transforms. I’m mesmerized by the above video.

Renz2LK spend about six hours over two days crafting the Optimus Prime costume. He used scrap EVA foam from his workshop to build the vehicle shell. He painted it using spray paint and added acrylics for weathering. Regarding using EVA foam, he said:

As for my son’s costume, it was basic geometric shapes, so it was pretty easy to just custom size each piece to fit him. As for the transforming part, I had seen him pretending to transform while playing in costume. I just created the cab portion of the truck to cover him and found that it was easy to flip it open when he stood up.

And another look at the transforming action:

via Reddit