If you were wondering what the tri-slosher is based on. The tri-slosher is called the ヒッセン in japanese which is 筆洗 written in katakana. 筆洗 means ink brush washer which is what the picture above is. It's a pail meant to store water and ink or paint for calligraphy or painting, which makes sense since the tri-slosher shares the inkbrush's and octobrush's brand.