Using Gallium liquid metal and casting Lego style figures and blocks in ice cube moulds. Gallium metal is a solid at room temperature, and turns liquid at around 30°C. See more Gallium here: https://youtu.be/4u6A40QTWVI?list=PLQ_T2NppE0PI1soHO1bZmTJOGTynkRYHD
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