Abstract <p>Einstein taught us through general relativity that mathematics/geometry is the language of nature. He also taught us that mass can be converted into energy. Our work advocates for the conversion of energy into matter, such as mass, charge, and the cosmological constant, discussed within the context of colliding waves in general relativity. The Big Bang is thought to be the prototype example of creating matter at large from an infinite concentration of energy. Our proposal provides an alternative example by using the power of nonlinear collision processes in which energy transmutes into solid matter. Our motto in this paper is: Collision is creation, so let there be light to collide and create!</p>