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Graphics as Input

An image is equivalent to its symbolic expression. You can operate on an image as you would on a symbolic expression.
This input produces some disks:
In[1]:=1
✖
https://wolfram.com/xid/0dur3bzaj2s3n4da3m-h14kp
Out[1]=1
Type // InputForm after the graphic to get the symbolic expression that corresponds to the graphic:
In[71]:=71
✖
https://wolfram.com/xid/0dur3bzaj2s3n4da3m-f48dnl
In[72]:=72
✖
https://wolfram.com/xid/0dur3bzaj2s3n4da3m-exdj52
Type a Wolfram Language Replace command after the output graphic and evaluate:
✖
https://wolfram.com/xid/0dur3bzaj2s3n4da3m-c9rl65
The disks are now replaced by squares.
Out[2]=2