In an abstract painting of a lady sitting on a chair with deep thoughts, the artist employs non-representational forms and expressive techniques to convey the inner contemplation and emotions. 
 
Here are some elements that might be present in such a painting:
Expressive Lines and Shapes: The artist may use dynamic and expressive lines to convey the woman's posture, capturing the sense of introspection and contemplation. Abstract shapes could represent the complexity and depth of her thoughts.
 
Abstract Chair and Surroundings: The chair and the surroundings may be abstracted, with the artist using unconventional shapes or patterns to suggest the environment in which the woman is seated. This abstraction can symbolize the internal nature of her thoughts.
 
Gesture and Posture: The woman's posture on the chair may be captured through abstract gestures, emphasizing the body language that conveys deep thoughts. This could involve elongated forms, expressive curves, or abstract representations of hands engaged in contemplation.
 
The abstraction in the painting allows viewers to engage emotionally and intellectually, encouraging them to project their own thoughts and emotions onto the artwork. The artist's use of abstract forms invites a more subjective and personal connection with the lady's contemplative state.