What if the roof isn’t level? You can get the same effect by just measuring your starting point at the bottom.PS, this is the third room I've tiled - and while doing them I've developed my own technique that allows me to achieve a perfect result.
I think tiling looks much better if the top row is a full tile and perfectly straight - however as an inexperienced DIYer, millimetre correct measuring isn't my strong point. So I start at the top. All it takes is a bit of patience, allowing each row 15 minutes to 'grab' before moving to the next one.
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Odd you have such tiny slivers in the corner too of that green one. That could have easily been avoided rather than just starting with a full tile. Should have centred that wall area but I guess you couldn’t be arsed with the extra cuts ? Looks amateur that does