The phrase "a certain shape and" is correct and usable in written English.
It can be used when describing an object or concept that has a specific form or configuration, often in a more abstract or general sense.
Example: "The sculpture was designed to evoke a certain shape and feeling of movement."
Alternatives: "a specific form and" or "a particular outline and".
Everyone lives in a world of a certain shape, and a film must show that shape.
In 1967 the Times music critic William Mann wrote of the Beatles' Sgt Pepper's Lonely Hearts Club Band that it had "a certain shape and integrity new to pop song LPs, which are usually unconnected anthologies.
Puffing the ancient grains in Cheerios appears to represent "extensive processing," he said, though it's not as bad as some other types of processing, like pushing ingredients through an extruder to force them into a certain shape and size.
At the end of her book, one comes to feel that the fairy tale, like satire, is a genre with a certain shape and spirit that pops up all over the place, rather than a form with a single history.
It's not a show that says: 'Shall we all have a debate about this in the moment, while it's going on?', because it's a piece of art, and it has a certain shape and rhythm and gears that it goes up and down through.
In traditional Japanese gastronomy, there is not much room for individual choice: an herb might be changed, a new ramen topping invented, but most things are made at a certain time of year, in a certain shape and with a certain gravity.
The kinds of bodies we see on TV are generally a certain shape, size and color.
To return to an example mentioned above, the perception of an apple is complex, insofar as it consists of a combination of simple perceptions of a certain shape, colour, texture, and aroma.
There will be a way these things look to you when you see them: they will look to have a certain shape, color, texture, and arrangement relative to one another, among other things.
"I started getting preoccupied with my weight and then wanting to be healthy and it triggered my obsession with food and being a certain shape".
"We also had a player sent off last Saturday and we go to a certain shape when we go down to 10 men, which requites discipline and desire.
