●▲■

●▲■
Original name	●▲■
Release date	23 April 2010
Format	Mobile app
Lost?	Yes

●▲■, also known as マルサンカクシカク (Maru Sankaku Shikaku, lit. "Circle Triangle Square"), is an app developed by Outside Directors Company and published by P.R.O. Corp and Creators Guild Company for iPhone mobile devices. It allows users to create their own artwork using Sato's by dragging around circles, triangles, and squares, a process from which the app gets its name. It was first released on 23 April 2010, but has since been delisted. It was succeeded by KIMOKAWA, a similar but less-complex app where users would create a base then drag-and-drop preset stickers onto it.

Upon opening, the app features four buttons: Draw, Gallery, Sample, and Setting.

• Draw is the main mode of the app, where users can create and save art.
• Gallery displays an image gallery of creations saved in Draw mode.
• Sample is an additional gallery of creations made by OSD themselves. Clicking on a Sample image shows a replay of how it was made within the app, this was also possibly a feature in gallery mode.
• Setting contains standard configuration settings for the app.

Draw mode

Draw mode presents the user with a white 16x19 grid, on which a design can be created. Directly below it is an assortment of color palettes that can be cycled through by tapping the arrows on the left and right sides. Tapping a color applies it to the currently selected shape. At the bottom of the screen are six buttons: "TOP," which returns to the main menu, "●," "▲," and "■," which are used to select their respective shapes, a copy button which duplicates the shape being used, and "DONE," which allows the user to save their creation.