Only available as a Lego Insiders Reward
BPatterns provide a fluent, Smalltalk-native API on top of the rewrite engine, using ordinary Smalltalk blocks as patterns.
。关于这个话题，heLLoword翻译官方下载提供了深入分析
Rendering a character as a lower block and then as an upper block gives you two “frames” of motion within the same character and looks much smoother.
FT Edit: Access on iOS and web
PIXELS_DEFAULT_IMAGE