灰色になるまで Until It Turns Grey
赤とシアンの二色に分けた砂の面を、輪を描いて走る足が一歩ごとに蹴り、足に付いた砂を後の足跡へ運ぶ。26〜34秒ごとに走る向きを逆にし、輪の位置と大きさを変える。逆に走っても砂は分かれず、混ざった所は灰色に見える。
Sand split into red and cyan is kicked by feet running in a loop, and grains stuck to a foot are dropped in later prints. Every 26–34 seconds the runner turns round and the loop moves and changes size. Running the other way does not separate the sand; the mixed areas appear grey.
詳細 / Details
砂の粒は画面の2px。足は1秒に9歩、歩幅は約32px。一歩ごとに、足跡の範囲の粒の約35%を足に付いた粒と入れ替え、約55%を後ろと横へ蹴り出す。足跡は沈み、蹴られた砂は縁に盛り上がる。急な斜面は崩れる。ページを開いたときは、走り始めて7秒後の状態から始まる。分け目の線と輪は開くたびに変わる。
Each grain measures 2 px on screen. The runner takes 9 steps a second with a stride of about 32 px. At each step, about 35% of the grains under the foot are exchanged with grains carried on it, and about 55% are kicked back and to the side. The print sinks and the kicked sand builds a rim; steep slopes slump. The page opens 7 seconds into the run. The dividing line and the loop change on each visit.
“…until the sand gets mixed and begins to turn grey…”
「……砂が混ざって灰色になり始めるまで……」