How can you ensure a straight tile layout?

Using a straight edge or laser level is essential for ensuring a straight tile layout because these tools provide a precise reference line or level that guides the placement of tiles. A straight edge helps in establishing a perfectly straight line against which the tiles can be aligned, while a laser level projects a straight beam of light that indicates a level line across the surface. This accuracy is crucial, particularly in larger areas or when working with intricate patterns, as any slight deviation can become more pronounced over a distance, leading to misalignment.

The other methods mentioned do not offer the same level of precision. Estimating distances can introduce errors due to the natural human tendency to misjudge measurements visually. Following the wall's curvature can result in uneven and unsightly layouts if the wall is not perfectly straight. Finally, relying on eyeing the tile placement lacks the accuracy needed for a professional finish, as even small discrepancies can lead to noticeable flaws in the tilework. By employing a straight edge or laser level, the tilesetter can achieve a clean, professional appearance that adheres to industry standards.