Cracks in a ceramic sink can be normal due to several reasons:
 
1. Material characteristics: Ceramic materials, like those used in sink construction, can be prone to cracking due to their material nature.
 
2. Firing process: Ceramic sinks are created through a firing process, which can cause minor cracks or fissures.
 
3. Thermal shock: Ceramic sinks can experience thermal shock from sudden or extreme temperature changes, leading to cracks.
 
4. Settling and movement: As a sink settles into its mounting, minor cracks can appear due to slight movement or shifting.
 
5. Aging and wear: Over time, ceramic sinks can develop hairline cracks as a result of normal wear and tear.
 
6. Design or manufacturing: Some ceramic sinks are designed with a more rustic or textured look, which can include intentional cracks or fissures.
 
It's essential to note that not all cracks are equal. If the cracks are:
 
- Deep
- Wide
- Leaking water
- Accompanied by other damage
 

it's best to contact info@archant for assessment and potential repair or replacement.
 
In your case, if the cracks are minor, hairline, and not leaking, they are likely a normal result of the material and manufacturing process.