Unlike today's CG software, I did not use the method of modelling while looking at the three-view diagram on the screen with the mouse, but designed it once on graph paper, and then input values and other information as text in an editor. It was a daunting task when I think about it now, but it was quite interesting to see the letters and numerical values I had listed transformed into pictures. If the pluses and minuses or the digits of the numerical values were different, something ridiculous would be created. It made me laugh a lot.