[Python] why do I need to specify a variable name for a Canvas Image Object to apper in Tkinter

I created a custom canvas image object class of tkinter. But when I make a instance of it it does not appear in the canvas.

Here is a simple class to create a Image Object

import tkinter as tk
from PIL import Image, ImageTk

class CreateImage():
def __init__(self, canvas, image_path, pos=(300, 300)):
self.canvas = canvas
self.image_pos = pos
self.image = Image.open(image_path)
self.photoimage = ImageTk.PhotoImage(self.image)
self.image_obj = self.canvas.create_image((self.image_pos[0], self.image_pos[1]), image=self.photoimage)


If I don't mention a variable name for the instance of CreateImage it won't display

if __name__ == "__main__":
root = tk.Tk()
path = 'original.jpg'
root.geometry('600x600')
cvs = tk.Canvas(root, background="bisque")
cvs.pack(fill="both", expand=True)
CreateImage(cvs, path)
root.mainloop()


But if I write it like img1 = CreateImage(cvs, path) it works.

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