# Explain please - motion tween

**URL:** <https://forum.kirupa.com/t/explain-please-motion-tween/224457>\
**Category:** Uncategorized\
**Created:** [May 2, 2007, 3:39pm UTC](https://forum.kirupa.com/t/explain-please-motion-tween/224457 "2007-05-02T15:39:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lowmoan](https://avatars.discourse-cdn.com/v4/letter/l/c4cdca/32.png) [@lowmoan](https://forum.kirupa.com/u/lowmoan)\
**Post date:** [May 2, 2007, 3:39pm UTC](https://forum.kirupa.com/t/explain-please-motion-tween/224457/1 "2007-05-02T15:39:15Z")

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hi,

Why is not possible to tween between two different instances i,ie a square and a cirlce which you convert into a graphic ; but when you draw a circle and a square and select ‘tween shape’ it works ok?

i want to tween instances beacuse i can control the alpha values; unless you can control them with simple shapes.

Im really confused.