It is a balloon made with quadratic bezier (+ only one straight line is an extra) 2次ベジェで作ったフキダシ(+直線のみ1つおまけ)です
object tools can be used to move control points to change their shape.
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Sample control point of balloon recording
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オブジェクトツールで制御点を動かして形を変えられます
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収録フキダシの制御点見本
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Balloon alone フキダシ単体
Layer summary レイヤーまとめ