YouTuber Luís César N. Giestas, a product designer and teacher in Lisbon, experimented with making coffee accessories with coffee grounds.
He began by gathering coffee grounds from eighteen nations that produce them. These 15 pounds of coffee grounds he curiously identified as a year's supply. As a binding agent, he composed a mixture of water, honey, and agar. This mixture and the coffee formed a soft mass which he pressed into molds for a cup and a saucer.
Giestas then dried his cup and saucer for a week until they became firm. He made pour-over coffee and served it in this literal cup of coffee. The structure proved remarkably stable and survived boiling water.
At the conclusion of his experiment, Giestas broke up the coffee cup, melted it, and then used the mass to form a flower pot. What belongs in this flower pot? A coffee plant, of course!
-via David Thompson