The actual fascination
A soap bubble is a thin film enclosing air. Surface tension favours a small surface area; a freely floating single bubble tends towards a sphere. Joined bubbles and films held on frames can form other arrangements. The shimmering colours are also part of the film’s physics.
Watch a ready-made bubble
If you have an age-appropriate commercial bubble product, use it as labelled, away from traffic and slippery surfaces. Watch one bubble and describe its outline before and after it touches something. Do not put solution in your mouth or eyes.
Keep a disappearing-object record
Sketch the outline, add a colour word and note whether it was floating or touching a surface. Comparing two drawings can be more interesting than trying to remember a whole afternoon. You do not need to invent a chemical recipe.
Make the question smaller
Why are bubbles round? is a good opening. What shape was this bubble while it touched another one? is a question you can actually record. Start with the part you can describe, then use the source to explore the explanation.
Your small mission
Draw two bubble outlines and label the conditions you noticed.
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