甜瓜支架的靛蓝技术图

An elegant technical blueprint illustration of a small three-legged melon stand, one single perspective diagram, fine ivory construction lines on indigo paper, visible fastening joints and subtle dimension ticks without numbers or labels. Single standalone horizontal 3:2 image.

小型三脚甜瓜支架的优雅技术蓝图插画，单个透视图、靛蓝纸上细象牙施工线，可见紧固接点与细尺寸刻线，无数字标签，独立横向3:2。