free form

US /ˈfriː fɔːrm/
UK /ˈfriː fɔːrm/
"free form" picture
1.

自由形式的, 不受約束的

not restricted by rules or conventions; unconstrained

:
The artist used a free-form style in her painting.
這位藝術家在她的畫作中採用了自由形式的風格。
They had a free-form discussion with no set agenda.
他們進行了一場沒有固定議程的自由形式討論。