Remember video games such as Ninja Turtles, where the bosses end level changed color over time to measure your keystrokes? It’s a bit the same with this bag concept impactor whose color changes depending shots that you wear.

You will see the transfer of bright red to a sickly yellow under the effects of the rain of blows you Assen. Obviously this will require a minimum of physical effort and motor coordination on your part. But when you focus a little, you should do it.