Concept:
Alexander Calder was an internationally famous American sculptor best known for introducing:
\[
Kinetic Sculpture
\]
He revolutionized modern sculpture by creating artworks that moved naturally through air currents and mechanical balance.
Step 1:
Kinetic sculpture refers to sculpture that contains:
• Actual movement
• Mechanical motion
• Suspended balancing elements
• Dynamic interaction with air and space
Unlike traditional static sculpture, kinetic sculpture changes visually as it moves.
Step 2:
Alexander Calder became famous for creating:
• Mobiles
• Suspended moving sculptures
• Large abstract outdoor works
His mobiles used:
• Metal rods
• Balanced forms
• Hanging abstract shapes
These parts moved gently with air currents, producing constantly changing compositions.
Step 3:
The word:
\[
Mobile
\]
was associated with Calder's moving sculptures.
Their characteristics include:
• Balance
• Motion
• Rhythm
• Abstract geometry
Calder's works transformed sculpture from a fixed object into a dynamic experience.
Step 4:
Option (1): Functional sculpture
Functional sculpture refers to usable artistic objects, which is not Calder's main contribution.
Option (3): Stone sculpture
Calder did not specialize in traditional stone carving.
Option (4): Fibre Glass sculpture
Although modern sculptors use fibre glass, Calder is primarily associated with kinetic metal sculptures.
Step 5:
Alexander Calder is important because he:
• Invented modern kinetic sculpture
• Introduced movement into sculpture
• Expanded abstraction into three-dimensional space
• Influenced modern installation and public art
Step 6:
Since Alexander Calder became famous for kinetic sculpture, the correct answer is:
\[
\boxed{\text{(2) Kinetic sculpture}}
\]