Those eggs are lovely. I don't believe they did those straight lines, free hand with no straight edge. But they could spend most the day on one egg & get every straight line with wax & dipping in liquid then melting the wax & waxing then dipping at a different angle. You'd have to plan ahead on which areas you would cover with wax & when, which in itself would be hard & complex. Also those freehand eggs/areas are beautiful & I bet very very hard.