Here's why:

* High Energy: Gamma rays have so much energy that they interact with matter in a completely different way than visible light. Instead of bouncing off the surface, they are more likely to be absorbed or scatter.

* Absorption: Gamma rays can be absorbed by materials with high atomic numbers (like lead or concrete). This means the gamma ray's energy is transferred to the material's atoms.

* Scattering: Even if not absorbed, gamma rays can interact with matter through a process called Compton scattering. This involves the gamma ray transferring some of its energy to an electron, changing its direction. However, this is not a true reflection.

So, what can we use to "control" gamma rays?

* Shielding: Lead, concrete, and other dense materials are used to shield against gamma radiation. This absorbs the gamma rays, preventing them from reaching sensitive areas.

* Collimation: Specialized materials can be used to create collimators, which help to narrow the beam of gamma rays. This is used in medical imaging and other applications.

In summary: While gamma rays can be partially deflected through scattering, there is no perfect mirror that reflects them like visible light. Instead, we use dense materials to absorb them and collimation to control their direction.