But to serious matters, I noticed something funny about my Cera frame!
Look at the above photo, taken in my kitchen. Note that both wheels are 700c, with matching tires. The wheels are carefully placed on the line between the floor tiles, which ensures the bike is parallel to the countertop. The floor is horizontal. The counter is horizontal. The top tube is not horizontal; I did not measure, but I believe the front of the top tube is about 12 mm lower than the back. I've never seen that before!
I presume this was intentional, on the builder's part?
At any rate the bicycle rides just fine. It is very comfortable, and supremely stable: it rides hands-free as well or better than any other bike I've ridden. Stable enough to play with a camera while riding, anyway!