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I thought the tiles on my bathroom floor were perfectly flat and even on the ground, until I switched off the light and used that damn laser on the Dyson vacuum cleaner.

What greeted me was an uneven landscape of tiles that the naked eye just didn't see.

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Same, except with panel floor in our bedroom. Moved the bedframe and some cabinets around, suddenly the bed is really wobbly. Couldn't see why until I took my laser level and started sweeping the floor with the "red X" at a low angle, like it was sci-fi scanner.

That laser level actually revealed plenty of places around the apartment I dare not look at anymore, lest I get annoyed at the contractors... and the original builders of the block.

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