"fluid shapes" is a correct and usable phrase in English.
You can use it when referring to shapes or objects that move or change freely. For example, you might say "The clouds were moving in fluid shapes across the sky."
This idea she said was reflected in more fluid shapes.
When six women entered, delicate in pastel dresses, their fluid shapes replaced the tension with a more lyrical mood.
Ms. Missoni has taken something of a risk with her abstract camouflage patterns, patch-pocket cotton skirts and long fluid shapes redolent of a hippie beach wedding.
They were more than a welcome counterpoint to the typical fluid shapes, like blanket coats, asymmetrical wrap skirts and flowing long-sleeved gowns, also included in the show.
But typical of his style, for both men and women, is a careful balance between day and evening wear and between tailoring and fluid shapes.
Studies of nature -- say, the tip of a flower stamen -- inspired the screen's fluid shape.
How this forces the characters to reconsider their own identities and relationships is what gives "Burn This" its compellingly fluid shape.
Its striking fluid shape was designed to combine the outlines of three iconic chairs, but it's now become something of an icon itself.
From the beginning (in the 2003 model year) Nissan's design strategy for the Murano was to create the iconic un-S.U.V. with a fluid shape that would never be mistaken for a Honda Pilot, a Toyota Highlander — or a Nissan Pathfinder.
This two-button blazer and wool-crepe trouser has a light, fluid shape, ideal for warm days, and the straight-leg trouser hits just above the hip.
