According to research on twins, their genetic features are not the only reason they feel, think and act alike. External environmental influences are also a factor. Common experiences cause twins to develop in the same way. Scientific research into what it is to be a twin dates back almost 150 years. By comparison, research focusing on the virtual equivalent – the digital twin – is still in its infancy. Despite that, the digital twin has become synonymous with the industrial revolution and is feted as a key trailblazer accompanying Industry 4.0.